Bosch dishwasher error codes are a great way to diagnose your dishwasher and repair it. Error codes help to pinpoint where the problem lays with the dishwasher eliminating the guess work. If your dishwasher is not showing you an error code or if your Bosch dishwasher not working, then you will need to enter a diagnostics mode to retrieve the error code stored in the memory of the main PCB. Siemens dishwasher error codes are same as these Bosch dishwasher errors.
Bosch Dishwasher E01 Error – Pump Circuit Fault
Description:
E01 indicates that the pump control circuit on the main PCB has failed. Bosch dishwasher E01 error is fairly easy to diagnose and in most cases it is the main PCB that is at fault. But just to make sure that the wash pump is not the reason for the error it is best to check the wiring for continuity and the resistance on the motor windings to make sure it is not open circuit or short circuit. If a new PCB is installed and the motor has a short circuit it will damage the new PCB.
Action To Take:
- Check wiring harness to the wash pump for continuity.
- Check resistance of the motor windings.
- Replace main PCB/power-module.
Bosch Dishwasher E02 Error – Heater Relay Fault
Description:
Bosch dishwasher E02 indicates that the heater relay on the power module has failed. If you are handy, find the heater relay on the main PCB and replace it. Other wise the whole power module can be replace to rectify the E02 error.
Action To Take:
- Replace main PCB/power-module
Bosch Dishwasher E03 Error – Auxiliary Heater Relay Fault
Description:
E03 fault indicates that the auxiliary heater relay on the power module has failed.
Action To Take:
- Replace power module.
Bosch Dishwasher E04 Error – Heating Fault
Description:
Bosch dishwasher E04 error is a heating issue. Fault E04 is slightly harder to diagnose than regular heating faults because E04 can also indicate a problem with the zeolite air heater for drying cycle or the regular water heater fault. Unfortunately there is no test procedure to check the condition of the zeolite heater so it is best to check what we can first (water heater resistance and earth leakage) before replacing the zeolite heater.
Action To Take:
- Check heat pump for resistance and earth leakage.
- Replace zeolite heater.
- Replace power module.
Bosch Dishwasher E05 Error – Water Switch Triac Fault
Description:
Bosch dishwasher E05 fault indicates that the water switch triac on the power module is defective. This is a fairly straight forward error and the replacement of the power module should solve the E05 error on your Bosch dishwasher.
Action To Take:
- Replace power module.
Bosch Dishwasher E06 Error – Door Sensor Fault
Description:
Bosch dishwasher E06 error code indicates that the power module is not receiving a reading from the door hall sensor therefor does not know if the door is closed. Unfortunately there is not way of properly testing the door hall sensor, the best way to solve the Bosch dishwasher e06 error is by process of elimination and replace the cheapest part first which will be the door hall sensor. If replacing the door sensor does not solve the issue, it will be the main PCB that is at fault.
Action To Take:
- Check wiring.
- Replace hall sensor.
- Replace power module.
Bosch Dishwasher E07 Error – Drying Fault
Description:
Bosch Dishwasher E07 error indicates a problem in the drying system. Most likely it will be the fan that has failed. Dryer fan sucks out all the steam out of the dishwasher at the end of the cycle to dry the dishes faster. If you don’t want to fix this problem, you can simply leave the dishwasher door slightly ajar straight after the dishwasher finishes washing. This will do as good of a job as the fan and the washing results are not effected by this error.
Action To Take:
- Check wiring from PCB to drying fan.
- Check fan motor winding.
Bosch Dishwasher E08 Error – Loss of Water
Description:
Bosch dishwasher E08 error indicates that the water level has dropped unexpectedly after the cycle has started.
Action To Take:
- Check for overturned bowls/glasses that may have collected all the water.
- Inspect heat exchanger solenoids for leaks/operation.
- Check for kinked inlet hose.
Bosch Dishwasher E09 Error – Heating Fault
Description:
Bosch dishwasher E09 error indicates that the water in the dishwasher is not heating. This fault is most commonly caused by a burnt out heater. Make sure to check the resistance of the heating element first. Bosch dishwasher e09 error sometimes can be caused by a leak that shorts out the heating element. If you notice signs of a water leak in the base of the dishwasher, make sure to fix it before installing a new heatpump. Also, in some cases a cracked soldering joint on the heater relay can cause error E09 to appear. If the heating element checks out ok, check the soldering joints on the main PCB. A quick re-soldering of the heater relay can also be a cheap fix. Bosch dishwasher e09 error is fairly simple thing to resolve on your own.
Action To Take:
- Inspect wiring from main PCB to heatpump.
- Check resistance on the heater.
- Measure resistance of thermostat.
- If heater and thermostat are OK, replace main PCB.
Bosch Dishwasher E10 Error – Slow Heating
Description:
Bosch dishwasher E10 error indicates that the water is heating too slow and could possibly have excessive amount of limescale on heater. It is highly recommended to descale the dishwasher at least once in 3 months to keep your dishwasher running efficiently. If the Bosch dishwasher E10 error code keeps re-appearing after a few descale cycles, it is best to replace the heat-pump.
Action To Take:
- Descale the dishwasher.
- If error reoccurs, replace heatpump.
Bosch Dishwasher E11 Error – Thermistor Fault
Description:
Bosch dishwasher E11 fault indicates resistance values received from NTC(temperature sensor) to be out of range. On newer Bosch dishwashers the thermistor is integrated into the heat pump. It is located near the power plug for the heater.
Action To Take:
- Check wiring from PCB to NTC.
- Check NTC resistance.
- Contact 5-6 and 6-7 should have resistance of 10K ohm. And Contact 5-7 approx 20K ohm.
Bosch Dishwasher E12 Error – Heating Element Calcified
Description:
Bosch dishwasher E12 error indicates that the water is taking much longer to heat then it should. Mostly E12 error is caused by a calcified heating element. The heater efficiency is reduced by the insulation effect that the calcium has on the heater. In most cases this issue can be easily solved by running through a descaler that removed the calcium deposits and should help to get rid of Bosch dishwasher E12 error. Just make sure to use a dishwasher safe descaler.
Action To Take:
- Wash filters.
- Clean and descale the dishwasher.
Bosch Dishwasher E13 Error – Water Over Temperature Fault
Description:
Bosch dishwasher E13 error indicates that the water in the dishwasher is too hot, >75C. Check that the dishwasher is connected to cold water. Also a stuck relay on the power module can cause the Bosch dishwasher E13 error to appear due to constant heating of water.
Action To Take:
- Check that supply water temperature.
- Measure resistance of temperature sensor.
- Replace power module.
Bosch Dishwasher E14 Error Code – Water Inlet Fault
Description:
Bosch dishwasher e14 error code indicates that the flow meter is not registering that the water is entering the dishwasher. But the water is detected by the heatpump in the sump of the dishwasher. This is mostly caused by a faulty reed switch. Fairly simple fix. The reed switch is located on the side of the heat exchanger and it is a fairly easy to repair Bosch dishwasher error code e14.
Action To Take:
- Check wiring for continuity.
- Replace flow meter.
- Replace main PCB.
Bosch Dishwasher E15 Error – Leak Fault
Description:
Bosch dishwasher E15 error indicates that the flood sensor in the base of the dishwasher has been activated. When E15 error appears, the Bosch dishwasher drain pump will keep running non stop until the power plug is disconnected from the powerpoint. Bosch dishwasher very often leak from the sump seal, so make sure to check this area first.
Many online guides tell you to tilt the dishwasher when Bosch dishwasher error code e15 appears, but whatever you do, do not tilt your dishwasher. By tilting your dishwasher when it’s displaying E15 you can wet internal components that will short out. It’s best to unplug the dishwasher from the powerpoint, remove the front panel and soak up all the water with a sponge, this is a much safer option. Once the water has been soaked up, run the dishwasher with the panels removed to see where the leak is coming from. Electricity and water don’t mix therefor if you are not 100% comfortable, it’s best to call a professional. Because dishwashers have water running through every component so the Bosch dishwasher e15 error can appear quite often.
Action To Take:
- Disconnect the dishwasher from the power point
- Remove water from the base of the dishwasher and run the dishwasher with the covers removed to see where the leak is coming from.
Bosch Dishwasher E16 Error – Water Inlet Fault
Description:
Bosch dishwasher E16 error indicates that the flow meter has detected that the inlet valve is filling water into dishwasher when it should not be. This is caused by a stuck water inlet valve that is not shutting off completely. E16 error is a fairly straight forward problem and should be resolved by the replacement of the water inlet valve.
Action To Take:
- Replace inlet valve.
Bosch Dishwasher E17 Error – Water Flow Fault
Description:
Bosch dishwasher E17 fault indicates that water is been filled too fast. If the water pressure in your house is fairly high, a water restrictor valve can installed to the tap to slow down the flow of water. Restrictor valves are sold in most hardware shops and are hand screwed on to taps.
Action To Take:
- Check flow control of filling valve.
- Turn down the tap.
Bosch Dishwasher E18 Error – Water Inlet Fault
Description:
Bosch dishwasher e18 error code indicates that there is no water entering the dishwasher. This is one of the most common Bosch dishwasher error codes because very often people forget to turn on the tap and the water inlet valve can fail from time to time. If you are lucky, your Bosch dishwasher e18 error code is caused by a squished inlet hose in the back of the dishwasher, pull the dishwasher out by 30 cm and try to run it again. E18 is a very common Bosch dishwasher watertap error.
Action To Take:
- Check to make sure the tap is turned on and water inlet hose is not kinked behind the dishwasher.
- Check inlet valve and replace if faulty.
- Replace main PCB.
Bosch Dishwasher E19 Error Code – Heat Exchanger Valve Fault
Description:
Bosch dishwasher E19 error is a heat exchanger fault. Bosch dishwashers have a heat exchanger reservoir where the water is stored and then released into the dishwasher. When the drain valve fails, the dishwasher will not fill with water.
Action To Take:
- Check wires/plugs.
- Replace heat exchanger drain valve.
Bosch Dishwasher E20 Error Code – Heat Pump Fault
Description:
Bosch dishwasher E20 error code indicates that the resistance values on the heatpump are wrong. Bosch dishwasher e20 error code is very simple to diagnose with a multi-meter. Set the multi-meter to the ohm meter mode and measure the motor winding resistance and the wiring going from the main PCB to the motor. If the motor resistance and wiring is with in specification, the Bosch dishwasher e20 Error code will be caused by a faulty main PCB.
Action To Take:
- Check wires/plugs.
- Measure resistance on heatpump windings.
- EU/AU 240v heatpump motor resistance should be approximately 41.5 ohm (+- 4 ohm) and on some models can be 53.5 ohm (+- 4.5 ohm)
- USA 120v heatpump motor resistance should be approximately 12.4 ohm (+- 1 ohm) and on some models it can be 13.7 ohm (+- 1 ohm)
Bosch Dishwasher E21 Error – Heat Pump Fault
Description:
Bosch dishwasher E21 error indicates that the impeller of the pump is not rotating. This problem can be caused by 2 things. Firstly it could be a foreign object like a broken piece of glass stuck in the impeller or the bearings could be seized and not allowing the pump to rotate the impeller. If bosch dishwasher e21 error happen to show up, it is best to remove the heatpump and inspect it. If no foreign objects could be seen, then it is time to replace the heatpump.
Action To Take:
- Check heat pump for foreign objects.
- Replace heatpump.
Bosch Dishwasher E22 Error – Blocked Filter
Description:
Bosch dishwasher e22 error indicates that there is left over water in the bottom of the sump after the draining cycle is completed.
Start by cleaning the filter first. If the filter is not cleaned on a regular basis, it gets clogged up and prevents the water from circulating and draining completely.
To prevent Bosch dishwasher e22 error appearing on your dishwasher, make sure to regularly clean the dishwasher filter. If the filter is clean and error e22 is still occurring, check that the non return valve is not jammed open by foreign objects or allowing water to backflow from the drain hose back into the dishwasher. Check the drain hose and the drain pipes under the sink for restrictions that could be causing slow draining. Also check that the white pump chamber clip is clipped in properly. Bosch dishwasher e22 error is a fairly easy error to solve so hopefully your dishwasher will be running in no time.
Action To Take:
- Clean the filter in the dishwasher sump.
- Inspect non-return valve for blockage/damage.
- Check for blockages in hoses.
Bosch Dishwasher E23 Error- Drain Pump Fault
Description:
Bosch dishwasher E23 error indicates that the drain pump is faulty. E23 error is fairly easy to diagnose. Firstly pull out the pump from the machine and check for free rotation of the impeller and with a multimeter measure the resistance of the drain pump windings. Also make sure to measure the resistance of the wiring harness from the main PCB to the drain pump. If those 3 things check out ok, then most likely it’s the main PCB which is at fault for the Bosch dishwasher e23 error.
Action To Take:
- Check wires/plugs.
- Measure resistance of coils on drain pump and replace if out of range. Resistance between each point should be around 88 ohm (-+6 ohm).
Check out this video how to replace the drain pump on Bosch dishwasher.
And we also have a drain pump replacement guide here.
Bosch Dishwasher E24 Error – Draining Fault
Description:
Bosch dishwasher E24 error indicates that there is a problem with draining water from the dishwasher. This is a generic error that indicates that the dishwasher still has water in the sump. Sometimes this can be a tricky error to rectify, but follow the steps bellow and you should have the Bosch dishwasher e24 error solved fast and accurate.
Action To Take:
If the dishwasher is full of water when the fault appears:
- Clean filters and check drain pump for foreign objects.
- Make sure the drain pump cover is installed properly.
- Check drain hose and drain pipe under the sink for blockages.
If dishwasher is empty:
If Bosch dishwasher e24 error appears at the beginning of the cycle indicates that the heat pump impeller has become stiff and is giving a false reading that the dishwasher is filled with water. Most Bosch dishwashers detect presence of water in the tub by running the wash-motor/heat-pump and checks for resistance created by the water on the impeller. If the bearings in the wash pump start to seize up, this will give a false drain fault error and your the Bosch dishwasher e24 error will constantly show up even if the water is draining well and no water in the dishwasher is present.
Bosch Dishwasher E25 Error – Drain Fault
Description:
Bosch dishwasher E25 error indicates that there might be foreign objects in the drain pump or the drain pump cover in the sump is not clipped in properly. In most cases it is possible to see if there are any foreign objects stuck in the drain pump by removing the pump housing cover. Just be careful, sometimes sharp glass can get stuck inside the pump. Sometimes there can be something wrapped around the impeller shaft can could be stopping the pump from running, to fix this issue the pump needs to be removed. Since dishwashers have a lot of small objects go in with the dishes, Bosch dishwasher E25 error is a fairly common problem.
Action To Take:
- Check for foreign objects stuck in the drain pump impeller.
- Check that the white drain pump cover is not missing and is clipped in correctly.
- Replace drain pump.
Bosch Dishwasher E26 Error – Diverter Motor Fault
Description:
Bosch dishwasher E26 error indicates a problem with the diverter motor. The main PCB has not noticed any change in the position of the motor. Error E26 could be cause by a faulty diverter valve motor or something hard like a broken piece of glass stuck in the diverter valve preventing the valve from rotating.
Action To Take:
- Inspect diverter valve for foreign objects.
- Check wiring/plugs.
- Replace diverter valve.
Bosch Dishwasher E27 Error – Undervoltage Error
Description:
Bosch dishwasher E27 error indicates that 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.
Action To Take:
- Measure voltage in power point.
- Replace power module if proper voltage is supplied to the machine.
Bosch Dishwasher E28 Error – AquaSensor Fault
Description:
Bosch dishwasher E28 fault indicates problem with AquaSensor.
Action To Take:
- Check wires/plugs.
- Inspect AquaSensor for dirt.
Bosch Dishwasher E29 Error – Low Mains Voltage Error
Description:
Bosch dishwasher E29 error indicates that the dishwasher is receiving below the required voltage to operate. Measure the voltage in power point. If no power supply issues found, replace the power module.
Action To Take:
- Measure supplied voltage to dishwasher.
- Replace power module.
Bosch Dishwasher E30 Error – Over Voltage Fault
Description:
Bosch dishwasher E30 error indicates that the power module is receiving too high voltage >290V. This is one of the most rarest Bosch dishwasher error codes to appear.
Action To Take:
- Check house power supply.
- Replace Power module.
Hope these Bosch dishwasher error codes have helped with the repair or diagnosing of the dishwasher.