Power Module Fault (Pump Circuit Failure or Heating Issue)

The E01 error code refers to a pump control circuit failure on the main control board, however, with some dishwasher models, the fault can cause a lack of water in the dishwasher, which stops the heater from running and triggers the error code.

Power Module Fault (Heater Relay or Heating Issue)

The E02 error code indicates that the heater relay on the control board has a fault. With some models, the error can be caused by a faulty temperature sensor or thermistor.

Power Module Fault (Aux Heater Relay Fault or Water Inlet Valve Failure)

An E03 error code refers to an auxiliary heater relay fault on the main control board. However, with some models, it indicates that the water inlet valve needs to be replaced because the dishwasher cannot fill with water.

Power Module Fault (Heating Fault or Water Issue)

The E04 error code refers to a heating issue, which can be very difficult to diagnose. With some models, it may indicate that a spray arm is clogged and needs cleaning, or that the water flow sensor needs to be replaced.

Power Module Fault (Water Switch Triac Fault or Float Issue)

The cause of the E05 error code is a water switch Triac fault on the main control board. In some cases, the error code indicates a damaged float or defective float switch.

Door Mechanism Failure or Aqua Sensor Fault

Depending on the dishwasher model, the door may not be closing properly, or the aqua sensor may have a fault. Most likely it's a door mechanism failure, unfortunately, the sensor is difficult to access, and a door mechanism failure can be difficult to diagnose.

The aqua sensor (turbidity sensor) monitors the water quality, such as whether the water is clean or dirty. The aqua sensor is located on the circulation pump.

If the door is closing and locking, the sensor switch that monitors the door may be faulty and need to be replaced, or the main control board may have a fault.

Drying Fault

Either the drying fan or wiring from the control board to the drying fan needs to be checked and potentially replaced.

Loss of Water

The water level unexpectedly dropped during the cycle. Check for overturned dishes collecting water or a water supply issue.

Heating Fault

The main control board may have a heater relay fault, or the heater may be defective. The heater’s resistance can be checked with a multimeter to determine if it has failed. A trained technician will need to check the control board.

Slow Heating

The water heater may be affected by excessive limescale, or it may be defective. Deep cleaning and descaling the dishwasher may resolve the issue, or the heater may need to be replaced.

Thermistor or Temperature Sensor Fault

The resistance of the thermistor (integrated into the heat pump on newer models) or the NTC (temperature sensor) needs to be checked to diagnose the issue (see the tech sheet for the required resistance).

Slow Heating

The water heater may be affected by excessive limescale, or it may be defective. Deep cleaning and descaling the dishwasher may resolve the issue, or the heater may need to be replaced.

Water Temperature is Too Hot

Check the dishwasher is getting cold water and that the temperature sensor does not have a fault (check the sensor’s resistance with a multimeter).

Water Inlet Fault

The dishwasher’s flow meter (also called a reed switch) is not detecting that water is entering the dishwasher. The most common cause is a faulty flow meter. The flow meter is located on the heat exchanger and can be relatively easily removed and replaced to resolve the error code.

Dishwasher is Leaking

First, determine if you can see where the leak is coming from. If the dishwasher does not appear to be leaking, the flood sensor in the drain pan underneath the tub may be defective. Otherwise, a hose may be loose, or a gasket or spray arm may be damaged.

Water Inlet Fault

The dishwasher is filling with water when it shouldn’t. Replace the water inlet valve to fix the issue.

Water Level to High check flow sensor

The E17 error indicates that there is most likely an issue with the dishwasher water level being too high. When water enters the sump, it passes via a float chamber; if the level in the machine causes the float to rise, it indicates surplus water and activates the flood function, causing the pump to start working.

This can occur if the piping from the float chamber is blocked from grease build up. If the dishwasher is overflowing with water or displays this error message, Examine the tubing for obstacles that could cause the dishwasher to overfill with water. Remove any gunk and test the wash.

If the problem persists, make sure the float and switch are working properly and replace the float switch if necessary. We were unable to locate any additional information about your specific model. I have attached a service manual and also a video on float switch replacement.

Water Level too Low check valve

The E18 error code means the dishwasher is not filling with water. Check that the water supply line is turned on and not kinked. If the issue remains, replace the water inlet valve.

Dispenser or an Internal Valve

If the E19 error code appear it means that there is a problem with the dispenser or an internal valve (recirculating valve).

Blocked filter

The dishwasher’s filter needs to be emptied and cleaned of debris.

Drain Pump Blocked, Pump Cover Missing

The E25 error code indicates the drain pump is blocked or the drain pump cover is loose or missing.

Diverter Motor Fault

The E26 error code is a diverter motor fault when the main PCB has not detected any change in the position of the motor. Error E26 could be cause by a faulty diverter valve motor or a broken piece of glass stuck in the diverter valve preventing the valve from rotating.

Under Voltage Error

The power module is receiving bellow operation voltage from the power point. Check voltage from the power point, if house power supply is good, replace the power module.

Aqua Sensor Fault

(see Error code E06)

Low Mains Voltage

The dishwasher is receiving below the required voltage to operate. Measure the voltage at the power point. If no power supply issues found, replace the power module.

Voltage Too High

The power module is receiving voltage over 290V and is too high. Very rare error code to be seen on Bosch dishwashers.