Bosch Dishwasher Error Codes & Fault Finder

Likely cause

An internal fault has been detected on the heat pump motor circuit, commonly involving the control board or associated wiring.

What to check

1. Switch the dishwasher off at the breaker for around 30 seconds, then restore power and retest.
2. If the code returns immediately, the heat-pump circuit or control board needs further testing.

Likely cause

A relay on the main control board is reporting a fault and may not be switching a component correctly.

What to check

1. Reset power at the breaker for around 30 seconds and restart the dishwasher.
2. If the code returns, the relay, control board and connected wiring should be tested.

Likely cause

The heating system or its control electronics has failed an internal self-check.

What to check

1. Power-cycle the dishwasher for around 30 seconds.
2. If the fault returns, the heater and control circuit need further testing.

Likely cause

The diverter system that directs water between spray-arm circuits is not switching correctly.

What to check

1. Reset the appliance and retest.
2. If the fault returns, the diverter motor or valve and control-board output should be checked.

Likely cause

The door latch or sensor is not correctly reporting that the dishwasher door is closed.

What to check

1. Check that the door closes and latches firmly and that nothing is obstructing it.
2. Reset the appliance. If the error remains, the latch or sensor may need testing or replacement.

Likely cause

The fan responsible for circulating air through the Zeolite drying system has failed or may be obstructed.

What to check

1. Reset power and retest.
2. If the fault returns, the fan motor and related wiring should be inspected.

Likely cause

The internal heater within the heat-pump assembly has reported an electrical or heating fault.

What to check

1. Reset power and retest.
2. A recurring fault normally requires testing of the heat-pump heater assembly.

Likely cause

The heater used to regenerate the Zeolite drying material is reporting a fault.

What to check

1. Reset power and retest.
2. If the error returns, the Zeolite heater should be tested.

Likely cause

Mineral deposits may have accumulated inside the heat-pump system, particularly in hard-water areas.

What to check

1. Run a suitable dishwasher descaling cycle.
2. Keep dishwasher water-softener salt topped up where fitted and follow the appliance instructions for descaling.

Likely cause

The dishwasher may not be filling correctly, or the flow meter may be giving an incorrect reading.

What to check

1. Check the water supply tap is fully open.
2. Check the inlet hose for restrictions and reset the appliance.
3. A recurring fault may require inlet or flow-meter testing.

Likely cause

Water has reached the dishwasher base and activated the leakage protection system. An inlet hose issue, loose connection or internal leak may be responsible.

What to check

1. Turn off the dishwasher water supply.
2. Do not continue running cycles until the cause has been identified.
3. Check accessible hose connections for leaks or damage.
4. Internal leaks should be investigated by a suitably qualified person.

Likely cause

The dishwasher is not receiving water correctly. A kinked inlet hose or restricted water supply can cause this.

What to check

1. Check the inlet hose is not kinked, crushed or twisted.
2. Confirm the water supply is fully open.
3. If the supply is good and the fault remains, the inlet system may require testing.

Likely cause

Water is entering the dishwasher too slowly or the inlet system is not operating correctly.

What to check

1. Check the inlet hose for kinks or restrictions.
2. Confirm the water supply is fully open and has adequate flow.
3. A recurring fault may require inlet-valve testing.

Likely cause

The solenoid controlling the detergent dispenser is not operating correctly.

What to check

1. Reset power and retest.
2. Check the dispenser is not mechanically jammed or clogged with detergent residue.
3. If the code returns, the dispenser assembly may need testing.

Likely cause

A restriction, debris or limescale may be affecting the heat-pump assembly.

What to check

1. Reset the appliance and retest.
2. Consider descaling if limescale is suspected.
3. If the fault persists, the heat-pump assembly should be inspected.

Likely cause

A blocked filter, drain-pump area, drain hose or household waste connection can prevent the dishwasher from draining correctly.

What to check

1. Remove and clean the dishwasher filter.
2. Check the drain-pump area for debris and refit the pump cover correctly.
3. Check the drain hose for kinks.
4. Check the household waste connection for blockages.

Likely cause

The drain pump is not removing water correctly and may be obstructed or electrically faulty.

What to check

1. Check the filter and accessible drain-pump area for obstructions.
2. If the problem continues, the drain pump may need testing or replacement.

Likely cause

The dishwasher has detected a problem with its incoming electrical supply.

What to check

1. Reset the appliance once.
2. If the fault returns, the electrical supply or circuit should be checked by a suitably qualified electrician.

Likely cause

Electronic modules on the dishwasher are not communicating correctly.

What to check

1. Reset the dishwasher.
2. If the error returns, the control boards and wiring harness may need testing.

Likely cause

The motorised lower spray-arm system has not found its expected reference position.

What to check

1. Check that nothing is obstructing the lower spray arm.
2. Reset the appliance and retest.
3. If it returns, the motor or position sensor may require testing.

Likely cause

A general technical fault has been detected. LED-only models cannot identify the exact fault without further diagnosis.

What to check

1. Press ON/OFF to stop the cycle.
2. Switch off or unplug the appliance and wait around 2 minutes.
3. Restore power.
4. If the fault returns, turn off the water supply and disconnect power before further investigation.