Access our premium database of error codes, common faults, and professional repair solutions for Schulthess appliances.
Schulthess AL01: Water drainage failure detected in Washing Machine; drain pump cannot evacuate water within safety time limit.
The AquaStop system has been activated by water in the base tray of the machine.
Unplug and find the source of the leak. Common culprits are hoses, the drain pump housing, or the main tub seal. Dry the base pan to reset the switch.
Schulthess AL02: Door lock safety interlock fault in Washing Machine; door switch contact fails to close or open.
The program cannot start because the door is not detected as being securely closed and locked.
Close the door firmly. Check that no laundry is caught in the door seal. Inspect the door latch and lock mechanism for damage.
Schulthess AL03: Water drainage failure detected in Washing Machine; drain pump cannot evacuate water within safety time limit.
The drain pump is obstructed by debris, preventing the machine from emptying.
Open the service flap and unscrew the pump filter cap. Clean the filter and the pump housing of any foreign objects.
Schulthess AL04: Operational cycle fault detected during Washing Machine program execution.
The machine is not receiving water from the supply.
Check that the water tap is fully turned on. Make sure the inlet hose is not bent or kinked. Clean the filter screen at the tap connection.
Schulthess AL05: Motor drive or inverter rotation anomaly in Washing Machine; drum/motor fails to spin at target RPM.
A fault has been detected with the drive motor, often related to the carbon brushes or an overload condition.
Check the motor's carbon brushes for wear. Inspect wiring and connections to the motor. Allow the machine to cool if it was heavily loaded.
NTC sensor fault (drying)
The temperature sensor for the drying circuit is faulty or has a bad connection.
Check wiring and connections to the drying NTC sensor. Test sensor resistance and replace if out of specification.
Schulthess E03: Water level pressure sensor/switch frequency anomaly detected in Tumble Dryer.
The pump that removes condensed water is blocked, the container is full, or the level switch is faulty.
Empty the condensate water container. Check the pump and its hoses for blockages. Test the float switch mechanism.
Schulthess E04: Operational cycle fault detected during Tumble Dryer program execution.
The fluff/lint filters or the heat exchanger/condenser are clogged, preventing proper airflow.
Thoroughly clean all fluff filters. For condenser dryers, remove and rinse the condenser unit. For heat pump dryers, carefully vacuum the heat exchanger.
Temperature sensor (NTC) error
The NTC temperature sensor is defective, or its wiring is disconnected or damaged.
Check the wiring to the NTC sensor. Test the sensor's resistance; it should change with temperature. Replace the NTC sensor if faulty.
Schulthess F2: Water/air heating failure in Washing Machine; heating circuit does not reach set temperature.
The heating element has failed, or there is an issue with the wiring or the heater relay on the main control board.
Test the heating element for continuity. Inspect the wiring between the element and the control board. Check the control board for visible damage.
Schulthess F3: Water level pressure sensor/switch frequency anomaly detected in Washing Machine.
The pressure switch (level sensor) is faulty, or the pressure hose connected to it is blocked, kinked, or has come off.
Inspect the pressure switch hose for blockages or damage. Check the wiring to the sensor. Replace the pressure switch if it is defective.
Schulthess F4: Water drainage failure detected in Washing Machine; drain pump cannot evacuate water within safety time limit.
The drain pump is blocked, the filter is clogged, the drain hose is kinked or blocked, or the pump itself has failed.
Clean the drain pump filter. Check the pump impeller for foreign objects. Ensure the drain hose is clear. Test the pump motor.
Motor tacho generator error
The motor's speed sensor (tacho) is faulty or has a poor connection, preventing the control board from reading the motor speed.
Check the wiring to the motor's tacho coil. Test the tacho coil for correct resistance. Ensure the tacho magnet is secure on the motor shaft.
Schulthess F6: Motor drive or inverter rotation anomaly in Washing Machine; drum/motor fails to spin at target RPM.
General motor error, which could be worn carbon brushes (on older models), a faulty motor winding, or a motor control board issue.
Check motor carbon brushes for wear and replace if shorter than 15mm. Inspect motor wiring and test motor windings for continuity. Check the motor control module.
Door lock mechanism fault
The door lock is not engaging or disengaging correctly, or the control board is not receiving the correct signal from the lock.
Ensure the door is closing properly. Check the door lock wiring and the lock mechanism itself for damage. Replace the door interlock if faulty.
Communication error with motor electronics
There is a communication breakdown between the main control board and the motor control module.
Check all wiring and connectors between the main PCB and the motor control unit. Reseat connections. If the issue persists, one of the boards may be faulty.
Main board software/EEPROM error
The main control board has a software corruption or a memory (EEPROM) failure.
Try resetting the machine by disconnecting it from power for 15 minutes. If the error returns, the main control board will likely need to be replaced.
Schulthess F10: Water inlet / filling timeout in Washing Machine; appliance fails to fill to minimum operational level.
The machine has failed to fill with water in the allotted time. The water tap may be closed, the inlet hose kinked, or the inlet valve filter blocked.
Ensure the water supply tap is fully open. Check the inlet hose for kinks. Clean the small mesh filter inside the water inlet valve connection.
Communication error between modules
A communication fault has occurred between the main control board and the display/user interface board.
Check the ribbon cable and other wiring connections between the main control board and the display board. Ensure connectors are secure and not corroded.
Schulthess F13: Water inlet / filling timeout in Washing Machine; appliance fails to fill to minimum operational level.
The water inlet solenoid valve is defective (stuck open or closed) or its wiring is faulty.
Test the solenoid coil(s) on the water inlet valve for correct resistance. Check wiring to the valve. Replace the valve assembly if faulty.
Leakage detected / AquaStop activated
Water has collected in the base pan of the appliance, tripping the flood protection float switch.
Unplug the appliance. Carefully tilt it backwards to drain the water from the base. Locate and repair the source of the leak (e.g., hose, pump seal, tub seal).
Schulthess F24: Water level pressure sensor/switch frequency anomaly detected in Washing Machine.
The pressure switch has detected a water level that is too high, often due to a stuck water inlet valve.
Disconnect from power. Check if the water inlet valve has stuck open. Inspect the pressure switch and its hose for faults.
Schulthess F34: Door lock safety interlock fault in Washing Machine; door switch contact fails to close or open.
The door lock mechanism has failed to engage, possibly due to a faulty lock, a misaligned door, or a control board issue.
Check for obstructions preventing the door from closing fully. Inspect the door hook and lock assembly. Test the door lock and wiring.
NTC sensor fault (out of range)
The temperature sensor is providing an implausible reading (e.g., short circuit or open circuit), indicating a sensor or wiring failure.
Unplug the machine and test the resistance of the NTC sensor. It should typically be around 5-6 kOhms at room temperature. Replace if open or shorted.
Schulthess F40: Operational cycle fault detected during Washing Machine program execution.
The incoming AC power supply voltage is too high or too low for the appliance to operate safely.
Check the household power supply socket. If the problem is with the mains supply, an electrician should be consulted. Power surges can also cause this.
Schulthess F43: Motor drive or inverter rotation anomaly in Washing Machine; drum/motor fails to spin at target RPM.
The triac or relay that controls the motor on the control board has short-circuited or failed.
This error usually points to a fault on the main control board or motor control module. The board will likely need to be repaired or replaced.
Motor or electronic control fault
This is a general fault indicating a problem with either the motor or the electronics that control it.
Perform a full diagnostic check of the motor (windings, tacho) and the control board. Check all related wiring harnesses.
Circulation pump motor tachometer error
The control board is not receiving a speed signal from the main wash motor.
Check the wiring to the circulation pump. Inspect the pump for any signs of seizure or blockage. The motor or its control electronics may be faulty.
Schulthess F63: Operational cycle fault detected during Washing Machine program execution.
A critical error has been detected in the main microprocessor on the control board.
Try a hard reset by unplugging the appliance for 30 minutes. If the fault persists, the main control board must be replaced.
Water leak detected (Dishwasher variant)
The AquaStop safety system has been triggered by water in the base of the unit.
Disconnect power and water. Identify and fix the source of the leak (hoses, seals, pump body). Dry the base pan completely to reset the safety switch.
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