Error code reference
Bosch Dishwasher Error Code F51
Heater pressure switch fault
Heater pressure switch fault — contacts at points 21/22 or 11/12 not closed when heater relay is activated during initial drain.
First step from the service manual
1
Check heater relay for open contact; check all plug connections are clean and secure; check connection wires for continuity.
The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.
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F51 on my Bosch SHXM78W55N
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Heater pressure switch fault — contacts at
From Service Manual 147517, p.49:
1.Check heater relay for open contact; check all plug connections are clean and secure; check connection wires for continuity.
2.Measure drain pump winding resistance at connector J7 on the main control. Expected: 12 to 16 ohms at room temperature.
3.Back-probe the pump driver output under load. Verify the board switches the pump at 120 VAC during the drain portion of the cycle.
Part 00620774
Drain pump
Related Bosch dishwasher codes
All Bosch dishwasher codes →- #AApexx display
- #BApexx display
- #EApexx display
- #FApexx display
- #GApexx display
- #HApexx display
- #KApexx display
- 0No faults detected during test program (SHU 4322/4326, SHU…
View all 240 Bosch dishwasher codes
- 0000Inverter error
- 0001Inverter error
- 0010Inverter error
- 0011Inverter error
- 0100Inverter error
- 0101Inverter error
- 0110Inverter error
- 0111Inverter error
- 1Control module has timed out due to an unidentified heating…
- 10Functional safety error without remanence; last status LEDs…
- 1000Inverter error
- 1001Inverter error
- 1010Inverter error
- 1011Inverter error
- 11Synchronisation error; power frequency error or low voltage.
- 1100Inverter error
- 1101Inverter error
- 1110Inverter error
- 1111Inverter error
- 16Water switch fault detected during test program (on 2 &…
- 2Heating system fault during test program
- 2HLast wash cycle too long (over 99 minutes); can be caused…
- 3Door open after program start.
- 4Unexpected heating detected (heating is taking place at a…
- 5Water intake period exceeds 5 minutes.
- 6More than 7 pumping trials or pumping time exceeds 54…
- 7NTC short circuit or NTC open circuit.
- 8Water supply error; overflow level reached due to valve not…
- 9Aquastop triggered; water in base tub or wire harness…
- CFault SIBRUSYM-motor.
- Check water supplyThe device does not draw water; a continuous acoustic…
- CLCycle complete indication displayed at end of wash cycle.
- DNo BUS-communication with SIBRUSYM-motor.
- d:01Motor control short circuited
- d:02Motor control interruption
- d:03Damaged motor control temperature sensor
- d:06Motor control NTC relay failure
- d:07Motor control (inverter) failed or motor shorted
- d:08Motor speed sensor failed
- d:09Voltage too high
- d:10Power limiter switch off
- d:11Voltage too low
- d:12Motor control high current switch off
- d:13Motor control high temperature switch off
- d:14Motor control high temperature warning
- d:15Power limiter warning
- d:16Motor high temperature switch off
- d:17Motor high temperature warning
- d:18Peak voltage too high
- DOOR OPENDoor is not closed properly during the defined time period.
- Door open or won't lockDoor left open, faulty door latch, or faulty door lock
- dr:01IGBT short circuit
- dr:02IGBT interruption
- dr:03Damaged motor control temperature sensor.
- dr:06NTC relay failure
- dr:07Motor control (inverter) failed or motor shorted.
- dr:08Motor speed sensor failed.
- dr:09Voltage too high at motor control.
- dr:10Motor winding short circuit
- dr:11Voltage too low
- dr:12Motor control high current switch off
- dr:13Motor control high temperature switch off
- dr:14Motor control high temperature warning
- dr:15Power limit warning
- dr:16Motor high temperature switch off
- dr:17Motor high temperature warning
- dr:18Peak voltage too high
- E:00No errors detected; result of DW-internal testing.
- E:0000No error
- E:01Faulty relay to heat pump heater, or heat/drain pump…
- E:0100Internal fault power module
- E:0103Power module defect (internal pump control)
- E:0105Ground fault at Zeolite heater or relay for Zeolite heater…
- E:0106Ground fault at water heater
- E:0107Temperature monitoring
- E:0108D-Bus power limit exceeded
- E:02Faulty heat pump heater relay, ground fault at heat pump…
- E:03Overheated power module/power cord connection detected by…
- E:04Faulty safety heater relay on power module, ground fault at…
- E:05Water switch runs continually; Sanitized LED flashes…
- E:06Door ajar or not properly latched, door popped open, faulty…
- E:07Fan defective or blocked, module on the fan defective (only…
- E:08Too little water detected during heating; the programme…
- E:09Heating element open circuit / safety relay error; power…
- E:10Zeolite heater heating circuit interrupted…
- E:11NTC1 to NTC2 internal check failed; functional safety error…
- E:12Only one NTC returns a signal; the dishwasher shuts down as…
- E:13Incoming water temperature too hot (>75°C / 167°F)…
- E:14Faulty flow meter
- E:15Water in base / float switch activated and dishwasher runs…
- E:16Water supply (impulses from flow sensor) without activation…
- E:17Wash cycle abruptly stops, dishwasher drains continually…
- E:18Dishwasher waits for water filling, then wash cycle…
- E:19Loose/faulty harness to detergent actuator or faulty…
- E:20Sanitized LED flashes; caused by heat pump blocked/clogged…
- E:2012Heating circuit interrupted (resistance, supply wires…
- E:2030Heating element is calcified
- E:2040Wire or plug interrupted
- E:2050Safety relay heater defective
- E:2060NTC resistance values are outside permitted range
- E:21Sanitized LED flashes; caused by faulty heat pump wire…
- E:2120Zeolite heater heating circuit interrupted…
- E:2130Heating fault
- E:22Sanitized LED is lit; caused by inlet water flow rate too…
- E:23Drain pump motor coil system check failed; functional…
- E:24Wash cycle completed prematurely, dishwasher won't drain…
- E:25Wash cycle completed prematurely, dishwasher won't drain…
- E:26Error code won't show during wash cycle; caused by faulty…
- E:27Low supply voltage continuously < 85 VAC (US) / 170 VAC (EU)
- E:28Aqua sensor doesn't run during wash cycle; error code won't…
- E:29Wash cycle abruptly stops or dishwasher won't run, or…
- E:30Dishwasher shuts off; error code won't show during wash…
- E:3000Filling fault
- E:31Poor washing and drying result due to rinse cycle without…
- E:3100Filling fault
- E:32Error code won't show during wash cycle. Caused by…
- E:3200No water supply at start of program or water supply flow is…
- E:3300Water supply flow is too high
- E:3400Water supply (impulses from flow sensor) without activation…
- E:6001Circulation pump fault
- E:6002Drain pump fault
- E:6101Open circuit to drain pump or resistance values of drain…
- E:6102Drain pump is blocked or drain pump cover in sump is…
- E:6103Non-return valve letting water by or draining is not…
- E:6900Dispenser or heat exchanger valve fault
- E:6A00Water switch fault
- E:8000Door Hall sensor fault
- E:8101Aquasensor fault
- E:9000Under/over voltage error
- E:9001Undervoltage fault
- E:9010Over voltage error (>142V)
- E:9240Zeolite fan defective or blocked, open circuit to Zeolite…
- E0Compartment temperature sensor 2 open/short.
- E01-00Defective electronics error, possibly related to power…
- E1Heating error
- E2NTC thermistor error
- E3Filling error
- E33Ice chute flap motor or switch error.
- E34Hopper flap switch error.
- E4Aquasensor error
- E5Safety float water level reached or motor speed error…
- E6Aqua sensor error
- E69-00Defective electronics error pattern.
- Er:01Door open
- Er:02Door lock cannot be released.
- Er:03Door lock cannot be locked
- Er:04Door actuation defective
- Er:05NTC interruption
- Er:06NTC short circuit
- Er:07Unexpected heating (temperature rise without actuating…
- Er:08Heating time exceeded
- Er:09No communication between control and inverter
- Er:10Flow meter gives wrong values
- Er:11Water inlet time exceeded
- Er:12Pumping time exceeded
- Er:13Safety level reached
- Er:14Overflow level exceeded.
- Er:15Pressure sensor gives failure voltage level
- Er:16Can't calibrate pressure sensor
- Er:20Spin cycle terminated
- Er:21Foam detected
- Er:22Frequency synch failure on control to mains
- Er:24Power supply relay to inverter damaged
- F00No faults registered in fault memory.
- F01Water/Heating NTC temperature sensor or leads…
- F02Water/Heating NTC temperature sensor or leads…
- F1Temperature stop fault
- F11Drainage fault
- F12Water intake fault at start of step
- F13Water intake fault at end of step
- F14Water intake fault
- F15Water intake fault
- F18Flow meter stationary state monitor
- F19Flow meter stiff and not turning freely
- F2Overfilling
- F24Heating relay contact fault
- F25Desired temperature fault
- F26Boiling protection
- F3Thermistor fault
- F4Water intake fault
- F40Electronic unit fault that cannot be repaired (e.g…
- F42Mains frequency registration fault
- F47Interface fault between selection-display module (BAE) and…
- F5Valve leakage
- F52Heater pressure switch has reset during heating
- F53Speed sensor fault
- F6Pressure sensor fault
- F63Slide shutter fault
- F67Circulation pump speed too low
- F68Circulation pump operation after switch-off
- F69Circulation pump blocked
- F7Pumping out fault
- F70Float switch fault
- F8Blocked filter
- F84Slide shutter positioning fault
- F85Slide shutter signal change fault
- F86Salt container lid contact fault
- F87Sensor softener fault
- F88Turbidity sensor fault
- F9Circulation fault
- F91Load size registration inactive
- FATurbidity sensor fault
- FBSpray arm divider fault
- FILTRCHGWater filter has been used longer than 6 months and needs…
- HIGHVOLTMains voltage is above the maximum limit (160V for US, 265V…
- LOWPOWERMains voltage is below the minimum limit (85V for US, 165V…
- MPower supply relay is defective, stuck together.
- Motor won't runFaulty speed control, triac short-circuited, or faulty…
- No drainingBlocked sensor, faulty water level controller, or…
- No heatingFaulty heater, voltage too low, or excessive scale on…
- No water fillingWater shut off, inlet strainer filters blocked, or water…
- Not drainingDishwasher did not drain within 5 minutes.
- Not fillingDishwasher did not fill after selected fill line was…
- Not HeatingWater temperature rose less than 9°F in 15 minutes during…
- NTC failedNTC thermistor short or open circuited, or faulty wire…
- OSafety level detected.
- Open or short circuit Door thermistor (Normal & Heat Dry)Temperature sensed was below 32°F or above 210°F on the…
- Open or short circuit Door thermistor (Normal/Normal)Temperature sensed was below 32°F or above 210°F on the…
- Oven TemperatureWater temperature sensed was greater than 180°F but less…
- OverfillLeak detection switch closed or 2nd level pressure switch…
- OverheatingFaulty control module causing heater to remain on when it…
- S3No faults detected (Apexx SH_99 full text display).
- TestNo heating
- Test (motor)Motor won't run
- Test (NTC)NTC failed (short or open circuited)
- Test (overheat)Overheating
- Turbidity Sensor High SignalTurbidity sensor count was greater than 65,279 in 0.4…
- Turbidity Sensor No Signal & Low SignalTurbidity sensor counter did not receive pulses from…
- Turbidity Temp SensorTurbidity temperature thermistor was shorted, open, or…
- WashDoor open or won't lock
- Wash (drain fault)No draining
- Wash (flashing)No water filling
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