This guide explains all Bosch Washer error codes (CH series) with simple troubleshooting steps to help you identify and fix common issues safely before calling a technician.
F02 / E17
Water Supply Issue
- Check water tap is fully open.
- Inspect inlet hose for blockage.
- Clean inlet filter screen.
- Verify household water pressure.
F17
Water Intake Timeout
- Check inlet valve operation.
- Ensure stable water supply.
- Inspect hose for kinks.
- Clean inlet filter.
F03 / E18
Drainage Failure
- Check drain hose for blockage.
- Clean pump filter.
- Inspect drain pump impeller.
- Remove debris from system.
F18
Drain Timeout
- Inspect drain hose routing.
- Check pump motor.
- Clean lint and debris.
- Restart cycle.
F16 / E16
Door Not Locked
- Close door firmly.
- Inspect latch mechanism.
- Check wiring to lock system.
- Replace door lock if faulty.
F34 / E27
Door Lock Failure
- Check latch alignment.
- Inspect locking motor.
- Reset machine.
- Replace lock system.
F21 / E21
Motor Failure / Drum Jam
- Check drum for blockage.
- Inspect motor brushes.
- Remove load imbalance.
- Replace motor if needed.
F01
Motor Triac Fault
- Reset power.
- Inspect motor wiring.
- Check PCB triac.
- Replace control board.
F23 / E22
Water Leakage Detected
- Inspect hoses and seals.
- Check detergent usage.
- Look for water under machine.
- Dry and restart system.
E23
Leak Sensor Activated
- Check base tray for water.
- Inspect internal seals.
- Dry sensor area.
- Restart machine.
E26
Water Pressure Sensor Fault
- Check pressure switch hose.
- Inspect wiring.
- Clean pressure chamber.
- Replace sensor if needed.
F57
Electronic Control Failure
- Reset power.
- Check PCB connections.
- Inspect moisture damage.
- Replace control board.
F29 / E28
Flow Sensor Error
- Inspect flow sensor.
- Check wiring connections.
- Clean inlet system.
- Replace sensor if faulty.
E29–E32
Load Imbalance
- Redistribute laundry.
- Reduce load size.
- Check drum suspension.
- Restart cycle.
E36–E38
Pressure System Fault
- Check pressure tubing.
- Clean air chamber.
- Inspect sensor system.
- Replace sensor if needed.
E28
Low Voltage Error
- Check power supply.
- Avoid extension cords.
- Inspect outlet stability.
- Use voltage stabilizer.
E90
Control Board Communication Error
- Reset power supply for 10 minutes.
- Check internal wiring.
- Inspect PCB board.
- Replace control board if needed.
F19
Heating Timeout
- Check heating element continuity.
- Inspect NTC temperature sensor.
- Verify wiring connections.
- Replace faulty heating components.
F20
Unexpected Water Heating
- Check temperature sensor operation.
- Inspect heater relay on control board.
- Verify heating circuit wiring.
- Replace defective components.
F25
Turbidity Sensor Fault
- Clean sensor area.
- Inspect sensor wiring.
- Check control board connections.
- Replace turbidity sensor if necessary.
F27
Pressure Switch Fault
- Inspect pressure switch hose.
- Check for blockages.
- Test pressure switch operation.
- Replace faulty pressure switch.
F28
Flow Meter Failure
- Inspect flow meter wiring.
- Check water supply pressure.
- Clean inlet components.
- Replace defective flow meter.
F31
Overflow Condition
- Turn off water supply immediately.
- Check inlet valve for sticking.
- Inspect pressure sensor system.
- Drain excess water and restart.
F37
Temperature Sensor Fault
- Inspect NTC sensor wiring.
- Test sensor resistance.
- Check PCB connections.
- Replace faulty temperature sensor.
F38
Temperature Sensor Short Circuit
- Disconnect power.
- Inspect wiring for damage.
- Test sensor continuity.
- Replace damaged sensor or wiring.
F42
Motor Speed Control Fault
- Check motor tachometer.
- Inspect drive motor wiring.
- Verify PCB connections.
- Replace motor or control board if needed.
F43
Motor Overload Protection Activated
- Reduce laundry load.
- Check drum for obstructions.
- Allow motor to cool.
- Restart wash cycle.
F44
Motor Rotation Fault
- Inspect drive motor.
- Check belt and drum movement.
- Verify wiring connections.
- Replace faulty motor components.
F59
3D Sensor Fault
- Reset the washing machine.
- Inspect sensor wiring.
- Check vibration detection system.
- Replace the sensor if defective.
F60
Flow Sensor Measurement Error
- Inspect water inlet system.
- Check flow sensor wiring.
- Verify water pressure.
- Replace faulty flow sensor.
F61
Door Lock Communication Error
- Inspect door lock assembly.
- Check wiring harness.
- Reset the appliance.
- Replace lock mechanism if necessary.
F63
Control Module Failure
- Disconnect power for 10 minutes.
- Inspect PCB for visible damage.
- Check internal connectors.
- Replace the control module.
F67
Control Board Coding Error
- Restart the appliance.
- Check firmware configuration.
- Inspect control board connections.
- Replace or reprogram the PCB.