Bosch Dishwasher Error Codes (Here’s what each code means!)

Bosch Dishwasher Error Codes

Bosch dishwashers are cream-of-the-crop appliances perfect for every household. They use top-grade technologies to make the process of dishwashing easier for their users.

One of the greater things about them is how they can give you a self-diagnostic report when they sense an issue in their system.

This article delves into one of the features that make Bosch dishwashers a must-have: error codes, what they mean, and how you can fix them!

Common Bosch Dishwasher Error Codes

Common Bosch Dishwasher Error Codes
CodeMeaningSolution
E0The dishwasher is in diagnostic test mode and has detected no errors.• To reset the code, restart the appliance by holding the Start button for at least 3 seconds.
E01, E02 or E11, E9The heat pump motor, the heating element, or the temperature sensor has failed.• Replace the heat pump motor, heating element, or temperature sensor if necessary.
E03The dishwasher isn’t filling with water.• Disconnect the water inlet valve from the dishwasher and inspect it for any damage.

• Replace it if necessary.Make sure that the water supply hose isn’t loose, kinked, or damaged.
E04An error in the water flow sensor wheel or the water switch has been detected.• Descale the impeller (found in the drainage of the dishwasher) to remove any limescale or calcium buildup.

• If this solution doesn’t work, replace the water flow sensor.
E05The tub is overfilled with water.• Replace the dishwasher float switch.
E06 or E28There is a fault in the door mechanism or the aqua sensor. • Replace the door switch.

• If the aqua sensor is the problem, take the appliance to a service center for a replacement.
E07The appliance is experiencing a drying issue.• Refer to your user manual to locate the vent fan and its motor. This part will need to be replaced.
E08The water supply level dropped during the cycle.• Check the tub for any overturned dishes. Then check the water supply hose to make sure it’s not loose, kinked, or damaged.

• Or check if the water inlet valve needs replacing.
E10 and E12The water is heating too slowly.• This issue involves the Crystal Dry chamber or the heating element, both of which are sensitive parts of a Bosch dishwasher.

• Take the appliance to a  service center to have it replaced or repaired.
E13The water in the tub is too hot.• If the issue is the thermistor or the temperature sensor, remove them from the appliance and replace them.

• If the issue is the heating element, take the appliance to a service center.
E14The flow sensor isn’t detecting any water entering the dishwasher.• Replace the water inlet valve or the water flow sensor.

• If neither of these seems to be the issue, contact a professional to check on your household’s water supply.
E15The dishwasher is leaking.• Siphon the excess water from the drainage and clean the area around the drain, as well as the dishwasher filter.

• Ensure that the water supply hose is connected securely and that it is not kinked, loose, or damaged.

• Check the spray arm for any damage and replace it if necessary.
E16 or E17Water is filling the dishwasher when it shouldn’t.• Check if the water inlet valve needs replacing.
E18There is insufficient water or the water level in the tub is too low.• Inspect the water inlet valve for any damages. Make sure that the water supply hose isn’t loose, kinked, or damaged.

• If the issue doesn’t seem to lie in these parts of the dishwasher, contact a professional to check the water flow rate in your household.
E19The dispenser has encountered an error.• Take the appliance to a service center and have the heat exchanger or dispenser solenoid checked.
E20 or E21The dishwasher is experiencing a heating issue, primarily due to a fault in the heat pump or heat exchanger.• Take the appliance to a service center for heat pump or heat exchanger replacement.
E22The dishwasher filter is clogged.• Clean out the dishwasher filter.

• If there is limescale buildup, use a descaler on the filter. Then run an empty cycle on the dishwasher.
E23, E24, or E25 There is a draining issue in the appliance, likely due to a blocked drain pump or drain filter.• Clean out the dishwasher filter and drain pump.

• If there is a limescale buildup, use a descaler on both parts. Then run an empty cycle on the dishwasher.
E27, E29, or E30There is an issue with the power supply to the appliance.• Unplug the appliance for at least five minutes, then power it back on.

• Make sure that your dishwasher is plugged directly into a power outlet. Do not plug it into an extension and avoid using an adapter.

• If the error persists, call an electrician to check on your household power supply.

Before we go into detail about these codes, remember that Bosch dishwashers can have a set of error codes unique to the kind of model you’re using.

Some of these codes may overlap with or be different from other models as they don’t follow a hard and fast rule, so it’s important to keep your user manual with you to crosscheck this information.

This article can serve as a general guideline for you so you’ll have an idea of which parts to check when certain errors come up.

Not every error code from your Bosch dishwasher requires contacting service to repair it, though. Some of these errors are quite simple and can be resolved all on your own, even if they’ll involve a bit of technical work.

Quick Tip:
• Some Bosch dishwasher models might only display a single digit as an alternative to error codes E01 to E09. In that case, it’s safe to assume the type of error you’re seeing based on the number after 0 for the codes included in this guide.

Common Causes of Bosch Dishwasher Error Codes and How to Fix Them

Common Causes of Bosch Dishwasher Error Codes and How to Fix Them

We at ApplianceGeeked go by a general rule in troubleshooting error codes: always restart your appliance first!

Some of these codes can appear due to a glitch, especially if you recently just experienced a power outage.

They can typically be resolved after a hard reset — that is, unplugging your dishwasher and letting it sit for a couple of minutes before powering it on again.

But if that doesn’t make the error code go away, then your first step to repairing the appliance is to always unplug it first or shut its power at its circuit breaker.

E0

Out of all the error codes from your Bosch dishwasher, this would be the safest to get — because an E0 indicates there are no errors at all!

E0 appears after you run a test cycle on the appliance and it finds no faults or previously recorded errors. In that case, all you need to do is restart the unit and you can expect it to function normally again.

Solution: Once the E0 has verified that there are no errors in your dishwasher, perform a reset on the appliance. 

Most Bosch models have their Start buttons double as a reset button, so holding this down for at least 3 seconds will be enough to do the trick.

Quick Tip:
• If you’re seeing an H24 on your dishwasher’s display, don’t worry! That’s not an error code either!
• An H24 indicates that there is a 24-hour delay in the appliance’s operation. This appears when you’ve put it on Delay Start.
• Delay Start is a special function in your Bosch dishwasher that allows you to schedule a cycle that would start at a later time. The digit beside the letter H in this code indicates the number of hours of delay until the scheduled cycle begins.
• To cancel this setting, press the Delay Start or the Start button for at least 3 seconds or until the code goes away.

E01, E02, E11

While E01, E02 or E11, and E09 are codes that indicate different issues, as far as the nature of their errors goes, they all have one thing in common: they point to a fault in the heat pump motor or temperature sensor.

Receiving any of these error codes may come with the same symptoms, particularly when the appliance is having difficulty heating water and/or drying the dishes normally.

In the case of an E01 error, the failure of the heat pump can also cause a shortage of water supply, which can deactivate the heater altogether.

Moreover, resolving issues with these error codes typically involves the same troubleshooting method, such as opening the dishwasher’s panel and inspecting the control board.

However, the codes themselves point to distinct components of your dishwasher. They are as follows:

  • E01: The heating pump motor.
  • E02: The temperature sensor or heater relay.
  • E11: A thermistor or NTC (temperature sensor).
  • E09: The heating element.

Error codes E02 and E11 may interchange depending on the model you’re using.

Solution: Repairing these errors will need an expert’s assistance, especially because it involves components that can directly affect the control board.

This is why it’s important to verify that these codes aren’t just glitches. When you get any of these codes, restart the appliance by unplugging it or cutting the power at its breaker for at least 60 seconds.

If the code or codes appear again after rebooting, you can go ahead and inspect the parts involved. The procedures for accessing these parts are the same:

  • Step 1: Unplug your Bosch dishwasher and turn off the water supply.
  • Step 2: Pull the appliance out from its cabinet to access the side and rear panels.
  • Step 3: Remove the side panel of the dishwasher. Doing this requires you to leave the dishwasher door open to access the screws holding the side panel cover in place.

Once unscrewed, carefully lift the panel cover up and pull it towards you to remove it.

  • Step 4: Remove the spray arm and dishwasher filter assembly inside the tub.
  • Step 5: Unscrew the front door panel, then close the door and pull the outer door panel down to remove it.
  • Step 6: You’ll notice a side cover on the bottom of the side panel. Remove this cover, then rest the appliance on its back on a blanket or a rug.

An E02 or E11 error might also require you to detach the base from the unit body. Afterward, you can then safely access the part you need to inspect.

Remember our advice though: if restarting the appliance doesn’t get rid of the code(s), it’s best to call for service!

E03

When you receive an E03 error code, you might also notice that the dishwasher tub remains empty. 

That’s because this code indicates that the dishwasher is having difficulty filling the tub with water, which is typically caused by an issue with the water inlet valve!

In this case, the solution is pretty straightforward: you’ll have to replace the water inlet valve.

Solution: To replace the water inlet valve, do the following:

  • Step 1: Unplug your Bosch dishwasher and turn off the water supply.
  • Step 2: Unscrew the lower access panel and set it aside.
  • Step 3: Open the dishwasher door and locate on its side the screws that secure the outer door panel. Unscrew them, then close the door and pull the outer door panel down to remove it.
  • Step 4: Locate the water supply line and inlet valve connection at the bottom of the dishwasher and disconnect it. Be careful of water that might spill.
  • Step 5: Remove the brass elbow from the inlet valve, then undo its mounting screws. Once you can pull the inlet valve out, disconnect the wiring harness connecting it to the dishwasher body.
  • Step 6: Disconnect the clamp on the fill tube and disconnect it from the inlet valve. Water might also spill out once you’ve done this.

Once you’ve successfully removed the water inlet valve, you can now replace it!

Quick Tip:
• Some models send an E03 or E3 code to signal an error in the dishwasher’s auxiliary heater relay. The best way to tell the difference is to see if the tub is filling up with water.
• If it’s not, replace the water inlet valve. But if it’s filling water just fine, observe if the dishes are drying properly or if the water is heating.
• Like with E01, E02, and E11 error codes, an auxiliary heater relay-related E03 can only be repaired with expert knowledge, so when you get this type of error, it’s best to contact service as soon as possible.

E04

An E04 error code indicates a water level issue in the appliance. 

Your Bosch dishwasher has a water level sensor that, as its name suggests, measures the water level inside the tub. When this component fails to read the water level correctly, it sends out an E04 error.

This component works closely with the water level switch, which is the part responsible for controlling the water supply going into the tub.

When the water level sensor reads that there is enough water in the tub, it sends the water switch a signal to turn the water supply off. The same happens during the draining process.

The water level switch can also fail on its own, and the appliance might send the same E04 error code to let you know.

Moreover, while these parts can wear down over time, failure in the water level sensor can also be caused by limescale or calcium buildup around the impeller.

If you live in an area with a high concentration of minerals in the water supply, you’ll likely encounter this issue.

Solution: Before attempting to troubleshoot the water level sensor itself, a safer option would be to get rid of the limescale around the impeller first.

If the buildup isn’t severe, you can use a vinegar solution to get rid of the minerals. But for more stubborn cases, you’ll need to prepare a descaler.

Afterward, do the following:

  • Step 1: Unplug your Bosch dishwasher.
  • Step 2: Remove the bottom rack and set it aside. Then, remove the spray arm and the filter on the bottom of the dishwasher.
  • Step 3: The impeller is located below the drainage. Siphon any excess water out of the drainage, then access the impeller by removing its cover.
  • Step 4: With the impeller cover removed, you can test if it can move freely using a pair of tweezers. If it has difficulty moving, there might be mineral buildup around it.
  • Step 5: Apply vinegar solution or descaler onto it and let it soak overnight. Then, rinse it with water and run an empty test cycle on the appliance.

Repeat this process until the limescale buildup has been completely removed.

If your dishwasher isn’t experiencing a calcium buildup, or if clearing the obstructive minerals around the impeller doesn’t resolve the error code, you’ll have to replace the water level sensor. 

To do that, follow these steps:

  • Step 1: Make sure the appliance is unplugged then turn off the water supply.
  • Step 2: Pull the appliance out from its cabinet to access the side and rear panels.
  • Step 3: Remove the side panel of the dishwasher. Open the dishwasher door to access the screws holding the side panel cover in place.

Once unscrewed, carefully lift the panel cover up and pull it towards you to remove it.

  • Step 4: You’ll notice a side cover on the bottom of the side panel. Pull it aside to access the water level sensor.
  • Step 5: The water level sensor is connected to a fill hose. You’ll have to unclip the fill hose first.

Prepare a towel and a small basin and watch out for leaks.

  • Step 6: Once the fill hose is disconnected, carefully pull it out from the access below the appliance. Be careful of electric plugs still connected to the dishwasher body.
  • Step 7: Disconnect the electrical plug from the sensor. Then, unclip the sensor from its housing to remove it completely.

Once done, you can now replace the water level sensor. Remember that the model you need for these components will depend on the dishwasher model you’re using, so be sure to consult your user manual for the specifications first.

Quick Tip:
• In some models, the E04 can also pertain to a heater relay issue. To verify this information, refer to your user manual or contact for service to check on your model.

E05

An E05 error is easy enough to confirm. If your Bosch dishwasher sends you this and you notice too much water in the tub, then you can be certain that the error isn’t a glitch!

An E05 signifies that your dishwasher’s tub is overfilled with water. This could be the fault of either your water inlet valve assembly or the water level assembly, particularly its water level switch.

As we’ve briefly mentioned before, the water level switch is responsible for shutting off incoming water when the water level sensor reads that there is already enough water in the tub.

When it fails, there’s nothing else to stop the water supply from coming in, hence why you’ll find your dishwasher’s tub overflowing.

Float switches normally wear down over time, but their failure could also be caused by poor maintenance of the appliance.

Solution: To inspect the water level or float switch, do the following:

  • Step 1: Unplug your Bosch dishwasher and turn off the water supply.
  • Step 2: Pull the appliance out from its cabinet to access the side and rear panels.
  • Step 3: Remove the side panel of the dishwasher. Leave the dishwasher door open to access the screws holding the side panel cover in place, then carefully lift the panel cover up to remove it.
  • Step 4: Pull the pressure chamber out of the dishwasher base and disconnect the inlet hose. Then, disconnect the wire harnesses connecting the component to the dishwasher body.
  • Step 5: With the pressure chamber now removed from the appliance, you’ll now have to pry the cover off. You’ll find the float switch inside locked in place.

Carefully press the locking tabs until the float switch is free.

Quick Tip:
• Other models will display an E05 error code for a fault in the spray arm diverter relay to the control board. If your dishwasher isn’t overfilled with water, then this issue might be what’s causing the E05.
• If that is the case for your appliance, try reassembling the spray arm in the bottom of the dishwasher and then restart the unit by unplugging it or powering it off at the circuit breaker for at least 60 seconds. 
• If the error code shows up again, you’ll need to inspect the diverter circuit. This will involve the dishwasher’s control board, so our advice is to bring the appliance to service for its safety.

E06 or E28

In most Bosch dishwasher models, especially newer ones, an E06 error pertains to a fault in the door mechanism, particularly the door switch or sensors.

Part of your dishwasher’s safety mechanism is to stop any operations when the door is open. It waits for you to close the door before continuing or starting any command.

The door switch is responsible for that particular task. It has magnetic detectors that help it tell when the door is properly closed or locked, then it sends a signal to the control board when the coast is clear.

When the door switch malfunctions, it can detect an open door even when the door is locked. Likewise, it can also detect that the door is closed even when it’s not.

In some cases, it won’t be able to detect the door at all and will thus send out an E06 error.

Solution: To replace a Bosch dishwasher’s door switch, make sure to consult your user manual to verify the model you need based on your dishwasher model.

Afterward, follow these steps:

  • Step 1: Unplug your Bosch dishwasher or turn its power off at its circuit breaker.
  • Step 2: Fully open the appliance’s door, then locate the screws on each side of the metal sheet. There should be three on each.

Take a Torx screwdriver and remove these screws.

  • Step 3: With the screws removed, close the door. Carefully pull the outer door cover downward, then pull it towards you to remove it.
  • Step 4: Open the washer door again and locate the screws on the upper lip of the door cover. These screws secure the upper control panel in place.

Take your Torx screwdriver and remove the screws.

  • Step 5: Close the door again while holding onto the upper control panel. Once the door is closed, carefully pry the panel off but be careful of its wire harnesses.
  • Step 6: The door switch can be found in the middle of the control panel.

If you want to unplug the wire harnesses connecting the panel to the dishwasher body for better access, take a photo of their connections for reference.

Otherwise, you can go on to remove the door switch with the panel still connected by the wires. Just set the panel onto a stool or elevated area.

Quick Tip:
• An E06 error code for some models can mean a fault in the dishwasher’s aqua or turbidity sensor. This is the part that controls the turbidity of the water supply and maintains the quality of water used.
• If you notice that your dishwasher is spraying murky or dirty water along with the E06, this means that the code is pertaining to a turbidity issue.
• In this scenario, you’ll have to test the aqua sensor for continuity — or better yet, have an expert look at your appliance.

E07

An E07 code from your Bosch dishwasher means that its drying fan is facing an issue and that the appliance is having difficulty drying the dishes thoroughly.

In this case, the fan motor assembly needs to be checked. This could either be a fault in the wiring or the fan motor itself.

Solution: The location of the drying fan may depend on the dishwasher model you’re using and the method to remove them will also differ. To know where your dishwasher’s fan is located, refer to your user manual.

Once you’ve pulled out the fan motor from its housing, run a continuity test on it using a multimeter. Here’s how you can do that:

  • Step 1: Set the multimeter to the lowest setting for ohms of resistance.
  • Step 2: Connect the multimeter’s lead to to the fan motor’s terminals.
  • Step 3: If the resistance on the multimeter reads 100-150 ohms, the fan motor is functioning properly. 

If the value doesn’t change, or if the reader displays a value outside the aforementioned range, the fan needs to be replaced.

E08

An E08 error code is something you’ll likely get a few minutes after the wash cycle has started. This code indicates a drastic drop in water level while your Bosch dishwasher was mid-operation.

Though it may sound like a complicated issue, sometimes the root cause is just overturned dishes in the cycle!

But if this isn’t the case, you have plenty of other parts to check, like the water inlet valve, the inlet hose, and even the dishwasher’s heat exchanger.

Solution: Before troubleshooting any technical part of the appliance, check the tub for any overturned dishes that might be triggering this error code.

If there are none, the next place you need to check is the water inlet valve or its hose. Make sure that the hose isn’t kinked or obstructed.

If the issue is the heat exchanger, you’ll have to take the appliance to a service center. This part needs expert technician knowledge to repair or replace.

E10 and E12

Both an E10 and an E12 error code point to another heating issue in your Bosch dishwasher, specifically that the appliance is taking too long in drying the dishes or heating the water supply.

Similar to E01, E02, E11, and E09, though, despite exhibiting the same symptoms, they implicate different parts of your dishwasher. Here is how to distinguish them:

  • E10: Crystal Dry chamber heater error
  • E12: Limescale buildup around the heater

Some Bosch dishwasher models have a Crystal Dry (Zeolite) feature that uses natural minerals in drying the dishes. With this technology, the minerals can collect moisture on your dishes, including plastic ones, after each wash cycle.

Once collected, the minerals will transform moisture into heat in high temperatures, maxing at 176°F (80°C). The hot and dry air that results from this will then be circulated throughout the tub.

This technology leaves your dishes 60% drier than usual — yes, even the plastic ones!

The chamber for this technology is located below the dishwasher, near the heater.

On the other hand, an E12 indicates a limescale or calcium buildup around the heater or heating element. To reiterate, this issue can occur more often with users who live in an area with hard water.

In the case of a limescale-related E12, deep cleaning your dishwasher can make the error go away.

Solution: If the issue is an E10 error referring to the Crystal Dry feature, you’ll have to take the appliance to a service center.

But if you’re getting an E12, you can remove limescale buildup by pouring vinegar solution or descaler in your dishwasher:

  • Step 1: Unplug your Bosch dishwasher.
  • Step 2: Remove the bottom rack and set it aside. Then, remove the spray arm and the filter on the bottom of the dishwasher.
  • Step 3: Siphon any excess water out of the drainage, then pour vinegar solution or descaler onto it and let it soak overnight.
  • Step 4: Rinse it with water and run an empty test cycle on the appliance.

Repeat this process until the limescale buildup has been completely removed.

E13

An E13 error code indicates that the water inside the dishwasher tub is too hot.

As we have already established, Bosch dishwashers are equipped with a heating element that can dry dishes or heat the water supply when needed. As such, you don’t need to continuously pump hot water into the appliance during a cycle.

Doing so might do more harm than good. Bosch dishwasher heaters can raise their temperature up to 161°F (71.7°C) for sanitization purposes.

When the appliance detects that the water inside the tub is getting too hot, or has gotten too hot, it will send an E13 code.

In some cases, this code can also be a result of a fault in the heat sensors or thermistors.

Solution: To access the dishwasher’s thermistors, do the following steps:

  • Step 1: Unplug your Bosch dishwasher and turn off the water supply.
  • Step 2: Pull the appliance out from its cabinet to access the side and rear panels.
  • Step 3: Remove the side panel of the dishwasher. Doing this requires you to leave the dishwasher door open to access the screws holding the side panel cover in place.

Once unscrewed, carefully lift the panel cover up and pull it towards you to remove it.

  • Step 4: Remove the spray arm and dishwasher filter assembly inside the tub.
  • Step 5: Unscrew the front door panel, then close the door and pull the outer door panel down to remove it.
  • Step 6: You’ll notice a side cover on the bottom of the side panel. Remove this cover, then rest the appliance on its back on a blanket or a rug.

The thermistor is located in the circulation pump assembly, which you’ll have to remove. You won’t miss it — it’s the largest component in the base of the dishwasher.

Once removed, carefully pull out the thermistor and replace it.

E14

When your Bosch dishwasher gives you an E14 code, this means that it’s not sensing any water flowing into the tub.

This could either be caused by a faulty water flow sensor, the water inlet valve, or your household water supply.

Solution: Procedures for troubleshooting this error may depend on which root cause you’re looking into. It’s good to start with the inlet valve first, as it’s the most accessible part of your dishwasher.

If the water inlet valve is intact and is not leaking, check the water flow sensor. To do that, follow these steps:

  • Step 1: Make sure the appliance is unplugged then turn off the water supply.
  • Step 2: Pull the appliance out from its cabinet to access the side and rear panels.
  • Step 3: Remove the side panel of the dishwasher. Open the dishwasher door to access the screws holding the side panel cover in place.

Once unscrewed, carefully lift the panel cover up and pull it towards you to remove it.

  • Step 4: You’ll notice a side cover on the bottom of the side panel. Pull it aside to access the water flow sensor.
  • Step 5: The water flow sensor is connected to a fill hose. You’ll have to unclip the fill hose first.

Prepare a towel and a small basin and watch out for leaks.

  • Step 6: Once the fill hose is disconnected, carefully pull it out from the access below the appliance. Be careful of electric plugs still connected to the dishwasher body.
  • Step 7: Disconnect the electrical plug from the sensor. Then, unclip the sensor from its housing to remove it completely.

If neither the water inlet valve nor the water flow sensor seems to be causing this issue, contact a professional to check your household’s water supply.

E15

When you get an error code E15, you might want to check your Bosch dishwasher for any leaks underneath. This code appears when the appliance has detected water in the base trough, and thus activated its built-in leakage protection system.

Leaks in the dishwasher can be caused by an overfilled tub due to a blockage in the drain, a loose hose, or damage to the gasket or the spray arm.

It could also be due to the floor sensor — the part responsible for detecting when the tub is filled — having become faulty and detecting an error when there’s none.

Solution: This issue is easily resolved by siphoning the water in the drainage and cleaning the filter below the dishwasher. As you clean the filter, check on the spray arm for any damage.

If the spray arm is damaged, this part will have to be replaced.

Check the hoses connected to the dishwasher as well and make sure that none of them are loose, kinked, or damaged.

E16 or E17

Similar to other error codes we’ve grouped, error codes E16 or E17 have the same symptoms and are sometimes interchangeable.

In general, these error codes signal that water is getting into the dishwasher or the filling system unprompted. For this issue, you’ll have to check the water inlet valve or the water hoses connected to the appliance.

Solution: Check that the water inlet valve is secure and isn’t leaking. Likewise, make sure the hoses aren’t loose, kinked, or damaged.

E18

Much like the E16 or E17 codes, the E18 pertains to a water flow issue in your Bosch dishwasher. 

In this code’s case, the water supply isn’t being pumped properly into the appliance, resulting in a water level that’s too low or a tub that isn’t filling at all.

Bosch dishwashers need an average water flow rate of 10 l/min. A less or weaker flow rate will trigger an E18 error.

Solution: Resolving this error requires a professional’s help in checking the water supply in your household to ensure that the water flow rate and pressure to your dishwasher meet the demands of your Bosch dishwasher.

Ensure also that the hoses to the appliance aren’t loose, kinked, or damaged.

E19

Depending on the Bosch dishwasher model you’re using, an E19 error can indicate an unresponsive heat exchanger or a fault in the detergent dispenser solenoid circuit.

The detergent dispenser, as its name suggests, disburses soap into the tub when the washing cycle calls for it. Your dishwasher has a door cover over this dispenser that only opens when prompted, and what prompts it is the dispenser solenoid.

When the dispenser solenoid malfunctions, it wouldn’t be able to signal the control board into opening the dispenser door and releasing soap onto the dishes.

If the heat exchanger is the issue, you might notice that your dishwasher is disbursing either hot or cold water only.

The heat exchanger is responsible for cooling down the hot water used in a cycle, which the appliance later uses to rinse the dishes. This way, ceramic and glass dishes retain their quality.

When the heat exchanger malfunctions, your appliance wouldn’t be able to switch from hot to cold water or vice versa.

Solution: The dispenser solenoid and heat exchangers are sensitive components. To resolve this, you’ll have to take the appliance to a service center and have an expert replace this part.

E20 or E21

Error codes E20 and E21 both point to a heating issue in your Bosch dishwasher. This can involve either the heating pump or the heat exchanger.

While they also share the same issue, each error code indicates a certain problem that contributes to the heating issue:

  • E20: Heat pump internal error
  • E21: Heat exchanger internal error or the heat pump is blocked

In the case of an error E21, a blocked heat pump may be caustic to a relay error from the heat exchanger, so when troubleshooting this part, it’s best to inspect both components.

Solution: As this error also involves the heat exchanger, you need to take your appliance to a service center.

E22

An E22 error code (bosch dishwasher e22 code) is one of the simpler errors you might get from your Bosch dishwasher — it means that the dishwasher filter is blocked.

You can find the filter at the bottom of the appliance, right below the bottom rack. As all filters do, this one catches food and soap residue and prevents them from sticking back onto the dishes you just cleaned.

This part is comprised of two parts: the fine mesh filter you see under the spray arm, and a cylindrical filter attached to it where dirt and gunk would stick to.

The severity of residue accumulated in this part may depend on how heavy your washing load is and how often you use the dishwasher, but all the same, you’ll have to perform a regular cleaning to keep the error E22 at bay.

Solution: To resolve an E22 error code, you simply have to clean the filter:

  • Step 1: Unplug your Bosch dishwasher, then remove the bottom rack and set it aside.
  • Step 2: Remove the bottom spray arm and set it aside. 

Afterward, twist the filter knob counter-clockwise to unlock it, then pull it out along with the mesh screen.

  • Step 3: Wash the mesh screen and the cylindrical filter individually. Use warm water and mild soap.
  • Step 4: If there is limescale buildup around the filter, soak the filter in a vinegar solution for 5 to 30 minutes, depending on how bad the buildup is.
  • Step 5: After soaking the filter, wipe it down with a dry cloth. Then rinse it with water.
  • Step 6: Reassemble the filter back in the dishwasher and run an empty cycle on the hottest and longest setting on your dishwasher. Do not add soap or detergent.
  • Step 7: After about 30 minutes, add some descaler to the bottom of the dishwasher.
  • Step 8: Let the rest of the cycle rinse the descaler off. Then run an additional empty cycle to wash the dishwasher completely.

E23, E24, or E25

The E23, E24 (e24 bosch dishwasher), or E25 error codes (e25 bosch dishwasher) pertain to a draining issue in your dishwasher. In some models, E23 and E25 are interchangeable.

Like other almost similar errors, these codes may share the nature of their issues, but they indicate a distinct component in the appliance. When you receive these codes, it means the appliance is having difficulty draining water due to:

  • E23 or E25: A clogged, blocked, or faulty drain pump
  • E24: A clogged drain filter

On the surface, an E22 and an E24 might seem similar because of the cause the codes are implicating, but remember: an E24 points to a draining error!

When you get an E24 code instead of an E22, this means that there’s already water in your dishwasher that can’t be flushed out.

Solution: Addressing these errors wouldn’t be different from cleaning the dishwasher filter or the impeller. The only difference is that you’ll have to first siphon out the water that didn’t drain.

In particular, to resolve an E23 or E25, you’ll have to:

  • Step 1: Unplug your Bosch dishwasher, then remove the bottom rack and set it aside.
  • Step 2: Remove the bottom spray arm and the filter. The pump is located in the drainage system.
  • Step 3: With protective gloves, remove the pump cover and clean out any obstruction in the area.

E27, E29, or E30

E27, E29, and E30 are codes that refer to a voltage or power issue in your Bosch dishwasher. 

When you get any of these errors, you might notice the appliance turning on but not being able to carry out any command, or it might keep stopping mid-operation.

You can usually resolve this issue by restarting the appliance, but if the error codes persist, you’d have to contact an electrician to check on your household power supply instead of a technician for your dishwasher.

Solution: This issue can usually be resolved by unplugging the appliance and letting it sit for at least five minutes, then powering it on again.

You should also make sure that the electrical plug isn’t loose or damaged, and that the dishwasher is plugged directly into an electrical outlet — not an extension, and ideally without the use of an adapter.

If these fixes didn’t work, contact an electrician to inspect your household’s power supply.


And there you have it!

Bosch dishwasher error codes may seem intimidating on the surface, but you can easily and quickly familiarize yourself with them. 

Most of them have a common denominator, so it’s easier to categorize them by the nature of their errors. Moreover, since some of them share symptoms, their troubleshooting methods can be identical too!


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