Bosch Dishwasher Error Codes

At RightFix, we understand how frustrating it can be when your Bosch dishwasher encounters an issue. Fortunately, Bosch dishwashers are equipped with error codes designed to help homeowners and appliance repair specialists quickly diagnose and troubleshoot problems. These error codes can indicate a variety of issues, from water supply malfunctions to electrical control board failures. By displaying a specific error code, your dishwasher provides valuable insight into the problem, making it easier to determine the necessary repair.

While you may be able to resolve some minor issues on your own, attempting to fix more complex problems without proper knowledge can be risky. If your dishwasher requires disassembly, we strongly recommend seeking professional assistance from a certified dishwasher repair technician. Dishwashers involve both electricity and water, posing potential hazards if handled improperly. Additionally, incorrect repairs can lead to further damage, increasing repair costs. Trusting experts like RightFix ensures that your appliance is repaired safely and effectively.

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Bosch Dishwasher Error Codes and Their Meanings

Error Code | Fault Description

E01 – Power Module Fault (Pump Circuit Failure or Heating Issue)
Indicates a failure in the pump control circuit on the main control board. In some models, it may cause a lack of water, preventing the heater from operating.
E02 – Power Module Fault (Heater Relay or Heating Issue)
Indicates a fault in the heater relay on the control board. It may also be triggered by a defective temperature sensor or thermistor.
E03 – Power Module Fault (Aux Heater Relay or Water Inlet Valve Failure)
Refers to an auxiliary heater relay issue on the main control board or a faulty water inlet valve preventing water from filling the dishwasher.
E04 – Power Module Fault (Heating or Water Issue)
May indicate a heating problem or a clogged spray arm affecting water flow. In some models, a faulty water flow sensor may be the cause.
E05 – Power Module Fault (Water Switch Triac or Float Issue)
Points to a failure in the water switch Triac on the main control board. It could also indicate a damaged float or a faulty float switch.
E06 – Door Mechanism Failure or Aqua Sensor Fault
The door may not be closing properly, or the aqua sensor (turbidity sensor) may be defective. If the door locks correctly, the sensor switch or main control board could be at fault.
E07 – Drying Fault
Indicates a potential issue with the drying fan or its wiring connection to the control board.
E08 – Loss of Water
Suggests an unexpected drop in water level during the cycle. Check for overturned dishes collecting water or water supply issues.
E09 – Heating Fault
May indicate a heater relay failure on the control board or a defective heater. A multimeter test is needed to check heater resistance.
E10 – Slow Heating
Limescale buildup or a defective heater could be the cause. Cleaning and descaling may help, or a heater replacement may be necessary.
E11 – Thermistor or Temperature Sensor Fault
The thermistor or temperature sensor (NTC) may have an issue. Resistance readings should be checked to diagnose the fault.
E12 – Slow Heating
Similar to E10, this error suggests that limescale buildup is affecting the heater’s efficiency.
E13 – Water Temperature Too High
Check that cold water is supplied to the dishwasher and verify that the temperature sensor is functioning correctly.
E14 – Water Inlet Fault
The flow meter is not detecting water entering the dishwasher. The most common cause is a faulty flow meter, which may need replacement.
E15 – Dishwasher Leak Detected
If no visible leak is found, the flood sensor in the drain pan may be faulty. Otherwise, check for a loose hose, damaged gasket, or faulty spray arm.
E16 – Water Inlet Fault
The dishwasher is filling with water unexpectedly. Replacing the water inlet valve should resolve the issue.
E17 – Water Level Too High
Indicates excessive water in the machine due to a float chamber blockage. Cleaning the tubing and checking the float switch may fix the issue.
E18 – Water Level Too Low
The dishwasher is not filling with enough water. Check the water supply line for kinks or blockages. A faulty water inlet valve may need replacement.
E19 – Dispenser or Internal Valve Issue
Indicates a problem with the detergent dispenser or a recirculating valve inside the dishwasher.
E20-E21 – Circulating Pump Issues
Either the winding resistance of the pump is faulty (E20) or the pump is blocked (E21).
E22 – Blocked Filter
The dishwasher filter needs cleaning to remove debris buildup.
E23-E25 – Drain Pump Issues
E23 signals a drain pump resistance fault, E24 indicates blocked drain filters, and E25 suggests the drain pump is blocked or its cover is missing.
E26 – Diverter Motor Fault
The diverter valve motor may be faulty, or debris (like broken glass) could be obstructing the valve.
E27-E30 – Power Supply Issues
E27 and E29 indicate undervoltage, while E30 signals excessive voltage (>290V). Check the power supply before replacing components.

RightFix – Your Trusted Bosch Dishwasher Repair Experts

While Bosch dishwasher error codes provide a helpful starting point, they are not always 100% accurate. At RightFix, our experienced technicians have encountered cases where the actual issue was different from what the error code suggested. If you're facing persistent problems with your Bosch dishwasher, let our experts diagnose and repair it correctly. Contact RightFix today for reliable Bosch appliance repair services!

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