Bosch Dishwasher Error Codes: A Must Know For Maintenance!

You’re in your kitchen, ready to get yourself spotless kitchenware, and then it happens – an error code appears on your Bosch dishwasher. 

Ugh, talk about a mood killer! But don’t let these error codes dampen your spirits, because they’re actually there to help. 

They’re like the golden ticket to easily fix almost any dishwasher issue, all by yourself!

Hearing that, you might be asking “How do I read the error code on my Bosch dishwasher?” – well, normally you’d need to go through a pesky manual or look all over the web. 

This time, I’ve got you covered with both the meanings of these codes as well as their fixes! Let’s get started.

List Of Bosch Dishwasher Error Codes

List Of Bosch Dishwasher Error Codes

Before we go further, here’s a quick look at what the errors actually are:

  • E0: Diagnostic mode
  • E01: Pump or temperature sensor problem
  • E02: Faulty heater relay or temperature sensor
  • E03: Problem with auxiliary heater relay or dishwasher water filling
  • E04: Heating system or water level sensor issue
  • E05: Water switch or float malfunction
  • E06: Door mechanism or turbidity sensor failure
  • E07: Drying problem.
  • E08: Sudden water loss during the cycle.
  • E09: Defective heater or heating relay.
  • E10: Zeolite Chamber (Crystal Dry) heater fault.
  • E11: Thermistor or temperature sensor error.
  • E12: Limescale in heat pump.
  • E13: Dishwasher water is too hot.
  • E14: Flow meter failure – washer cannot sense water coming.
  • E15: Water in drain pan.
  • E16: Dishwasher fills with water when it shouldn’t.
  • E17: Dishwasher not filling with water.
  • E18: Water level too low.
  • E19: Dispenser or internal valve problem.
  • E20:Heating issue.
  • E21: Blocked drain pump, clogged filter, or jammed impeller.
  • E22: Filter blockage due to residual water in the sump.
  • E23: Mechanical issue with drain pump
  • E24: Dishwasher not draining in general.
  • E25: Blocked or clogged drain pump
  • E26: Diverter motor problem.
  • E27: Power voltage issues.
  • E28: Aqua sensor fault.
  • E29: Low voltage issue.
  • E30: High voltage issue.

Bosch Dishwasher Error Codes- Causes And Fixes

Bosch Dishwasher Error Codes- Causes And Fixes

Now – what you’ve been waiting for. Here are the easiest ways to take care of all these error codes.

  1. E0: Diagnostic Mode
  • What Causes E0 on Bosch Dishwasher: This code appears when the dishwasher enters a diagnostic test mode, and it does not indicate any actual problems. It is a normal mode used for testing the dishwasher’s functionality.
  • Possible Solution To E0: This is normal diagnostic mode behavior; no action is needed.
  1. E01: Pump Or Temperature Sensor Problem
  • What Causes E01 on Bosch Dishwasher: The E01 error may be due to clogs, electrical issues or damaged components, while the temperature sensor problem can result from sensor malfunctions or wiring problems.
  • Possible Solution To E01: Check for blockages around the pump and ensure temperature sensor connections are secure. Restart the dishwasher and consider replacing the faulty pump or sensor if the error persists.
  1. E02: Faulty Heater Relay Or Temperature Sensor
  • What Causes E02 on Bosch Dishwasher: The heater relay may fail to provide power to the heating element, or the temperature sensor may provide inaccurate readings.
  • Possible Solution To E02: Try resetting the dishwasher (instructions by the end of this post). Inspect and replace the faulty heater relay or temperature sensor if necessary.
  1. E03: Problem With Auxiliary Heater Relay Or Dishwasher Water Filling
  • What Causes E03 on Bosch Dishwasher: The auxiliary heater relay may have electrical issues, or the water filling problem may be due to a faulty water inlet valve or water supply issues.
  • Possible Solution To E03: Ensure sufficient water supply and check the water inlet valve. Replace the faulty auxiliary heater relay if needed.
  1. E04: Heating System Or Water Level Sensor Issue
  • What Causes E04 on Bosch Dishwasher: The heating system may have electrical faults or component failures, while the water level sensor may provide inaccurate readings or have wiring problems.
  • Possible Solution To E04: Check the water level and heating element. Reset the dishwasher and replace faulty components if necessary.
  1. E05: Water Switch Or Float Malfunction
  • What Causes E05 on Bosch Dishwasher: The water switch might fail to detect the water level properly, or the float mechanism may get stuck.
  • Possible Solution To E05: Inspect the float for obstruction. Restart the dishwasher and consider replacing the water switch or float if the error continues.
  1. E06: Door Mechanism Or Turbidity Sensor Failure
  • What Causes E06 on Bosch Dishwasher: The door mechanism may have mechanical issues or electrical faults. The turbidity sensor might also be straight-up broken.
  • Possible Solution To E06: Ensure the door closes properly and clean the turbidity sensor lens. Replace if needed.
  1. E07: Drying Problem
  • What Causes E07 on Bosch Dishwasher: The drying fan may be defective, or there could be electrical problems in the fan circuit.
  • Possible Solution To E07: Check the drying fan for obstructions and inspect wiring connections. Replace the fan or damaged wiring if necessary.
  1. E08: Sudden Water Loss During The Cycle
  • What Causes E08 on Bosch Dishwasher: This could be due to a leak in the water supply or drain hoses, faulty seals, or damaged components.
  • Possible Solution To E08: Check water supply, hoses, and drain hose installation for leaks or damage.
  1.  E09: Defective Heater Or Heating Relay
  • What Causes E09 on Bosch Dishwasher: The heating element may have electrical problems, or the heating relay might fail to control the heater’s operation, triggering the E09 error.
  • Possible Solution To E09: Try resetting the dishwasher. Replace the faulty heater or relay if the error persists.
  1.  E10: Zeolite Chamber (Crystal Dry) heater fault.
  • What Causes E10 on Bosch Dishwasher: E10 can be caused by a dirty or malfunctioning heating element, limescale build-up, or problems with the heating circuit.
  • Possible Solution To E10: Try a reset first. Then run a deep cleaning cycle with a dishwasher cleaner. Replace the heater if the error continues.
  1.  E11: Thermistor Or Temperature Sensor Error
  • What Causes E11 on Bosch Dishwasher: The thermistor might be providing incorrect temperature readings, or the temperature sensor may have wiring problems, causing E11
  • Possible Solution To E11: Reset the dishwasher. Replace the faulty thermistor or sensor if necessary.
  1.  E12: Limescale in heat pump
  • What Causes E12 on Bosch Dishwasher: The same causes as E10 apply – something might be up with the heating element.
  • Possible Solution To E11: Perform a deep cleaning cycle using dishwasher cleaner and, if the issue persists, replace the heater.
  1.  E13: Dishwasher Water Is Too Hot
  • What Causes E13 on Bosch Dishwasher: E13 is triggered when the dishwasher’s water temperature becomes too hot. This can be due to issues with the cold water supply or problems with the temperature sensor.
  • Possible Solution To E13: Verify the cold water supply and inspect the temperature sensor. Replace if needed.
  1.  E14: Flow Meter Failure – Washer Cannot Sense Water Coming
  • What Causes E14 on Bosch Dishwasher: This E14 code could be due to a defective flow sensor, a clog  or a water supply issue.
  • Possible Solution To E14: Reset the dishwasher. Replace the flow meter if the error persists.
  1.  E15: Water In Drain Pan
  • What Causes E15 on Bosch Dishwasher:  This E15 error can happen due to leaks in the dishwasher’s tub, hoses, or pumps.
  • Possible Solution To E15: Turn off and dry the base area. Regularly clean the filter to prevent blockages.
  1.  E16: Dishwasher Fills With Water When It Shouldn’t
  • What Causes E16 on Bosch Dishwasher: E16 is typically caused by a faulty water inlet valve that fails to shut off the water flow properly.
  • Possible Solution To E16: Check the water inlet valve for issues and fix it if necessary.
  1.  E17: Dishwasher Not Filling With Water
  • What Causes E17 on Bosch Dishwasher: The E17 error may be the result of a malfunctioning water inlet valve.
  • Possible Solution To E17: Check the water supply and inspect the water inlet valve. Replace if needed.
  1.  E18: Water level too low
  • What Causes E18 on Bosch Dishwasher: This E18 error could be due to issues with the water supply, such as clogged filters or insufficient water pressure.
  • Possible Solution To E18: Try the same steps as E17.
  1. E19: Dispenser or Internal Valve Problem
  • What Causes E19 on Bosch Dishwasher: The E19 error code on your dishwasher indicates a problem with the dispenser or an internal valve. It likely resulted from a malfunction in the detergent dispenser or a valve during the dishwasher’s operation.
  • Possible Solution To E19: For your safety, don’t try to fix E19 yourself. Turn off the dishwasher and water tap. Book a professional technician to identify and repair the specific issue with the dispenser or internal valve. They’ll get your dishwasher working again safely and efficiently.
  1.  E20: Heating Pump Internal Error 
  • What Causes E20 on Bosch Dishwasher: The E20 error code on your washing machine indicates there is inconsistent heating during the washing process. This issue might be caused by a faulty temperature sensor or a malfunction in the heating element.
  • Possible Solution To E20: First, try resetting the washer by turning it off, then on. This may fix the issue. Next, check the temperature sensor for damage or loose connections. 
  1. E21: Heating Pump Blocked
  • What Causes E21 on Bosch Dishwasher: E21 points to problems with the dishwasher’s heat pump or heat exchanger.
  • Possible Solution To E21: Check for faults in the heat pump, impeller and motor. Replace or fix as per your findings. Alternative fixes are also available in this bosch dishwasher e21 error post.
  1. E22: Filter Blockage Due To Residual Water In The Sump
  • What Causes E22 on Bosch Dishwasher: This E22 error can occur if the dishwasher doesn’t drain properly or if there’s a clog in the drainage system.
  • Possible Solution To E22: Clear the filter from any trapped water or debris, and check the drainage system for any blockages.
  1. E23: Mechanical Issue With Drain Pump
  • What Causes E23 on Bosch Dishwasher: The E23 error could be due to a faulty pump, electrical issues, or blockages in the drainage system.
  • Possible Solution To E23: Check the drain pump for obstructions or damage.
  1. E24: Dishwasher Not Draining In General
  • What Causes E24 on Bosch Dishwasher: E24 can be caused by clogs in the drain hose, blockages in the pump, or pump malfunctions.
  • Possible Solution To E24: Investigate and address the cause of improper drainage, such as clearing clogs or replacing the pump.
  1. E25: Blocked Or Clogged Drain Pump
  • What Causes E25 on Bosch Dishwasher: E25 is caused by obstructions that prevent proper water drainage.
  • Possible Solution To E25: Remove the blockages from the drain pump, filter, or impeller to allow proper drainage.
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Note: The above error codes have similar meanings, but have different causes and fixes.
  1. E26: Diverter Motor Problem
  • What Causes E26 on Bosch Dishwasher: E26 is triggered by the diverter motor having electrical problems or mechanical faults.
  • Possible Solution To E26: Check the diverter motor for damage or malfunction.
  1. E27: Power Voltage Issues
  • What Causes E27 on Bosch Dishwasher: E27 happens because of power voltage problems caused by electrical fluctuations, improper wiring, or issues with the power supply.
  • Possible Solution To E27: Unplug the dishwasher and check the power supply. Contact an electrician if needed.
  1. E28: Aqua Sensor Fault
  • What Causes E28 on Bosch Dishwasher: E28 is triggered by a big failure in the dishwasher’s aqua sensor. 
  • Possible Solution To E28: None, full disassembly required. Better to contact a technician
  1. E29: Low Voltage Issue
  • What Causes E29 on Bosch Dishwasher: The Bosch dishwasher shows an E29 error when it doesn’t receive enough voltage to function properly.
  • Possible Solution To E29: Examine the voltage at the power point. If no issues with the power supply are identified, try replacing the power module.
  1.  E30: High Voltage Issue
  • What Causes E30 on Bosch Dishwasher: The E30 Code is pretty much the opposite of the E29 Code.
  • Possible Solution To E30: If you see E30 on your Bosch dishwasher, unplug it right away. Check the power cord and outlet for damage. If the voltage exceeds 120 volts, get help from a technician or electrician to fix it. Don’t use the dishwasher until it’s resolved to avoid more problems.
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How Do I Manually Reset My Bosch Dishwasher Error Codes?

How Do I Manually Reset My Bosch Dishwasher Error Codes

To manually reset Bosch dishwasher error codes, follow these steps:

  1. Power off the dishwasher and disconnect it from the power supply.
  2. Wait for 1 to 2 minutes.
  3. Reconnect the power and switch on the dishwasher.
  4. The error code should be cleared, and the dishwasher is ready to use again.


What do the letters and numbers mean on Bosch dishwashers?

The letters and numbers on Bosch dishwashers are either settings and features or error codes.

What does blinking light mean on Bosch dishwasher?

A blinking light on a Bosch dishwasher means it’s either operating or has a fault with a micro switch inside the door latch assembly. Check the manual for details.

What is the error code for a Bosch dishwasher leak?

E15 is the error code for a Bosch dishwasher leak, indicating water in the base.

What does red blinking light on floor mean on Bosch dishwasher?

The red blinking light on the floor of a Bosch dishwasher is a feature called “InfoLight,” which shows the washer is in use.

Final Thoughts

As you can see, these codes are super handy for helping you take care of issues before they get worse. 

And we can’t have that now, can we? You’ll not only be looking at an expensive trip to the technician but also a potential safety hazard! 

So, try to keep all these codes in mind after you’ve taken care of the one you’re seeing. 

Or even better, you could bookmark this post, so you can come back to it if you ever get another error code.

See also  GE Dishwasher Beeping: 10 Patterns And What To Do About Them

That’s all for today, good luck with fixing your washer!

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