Vaillant boiler faults: fault codes, causes and parts (page 2 of 2)

Codes 151 to 228 of the 228 fault codes for Vaillant. Looking for a specific code? Use the search on the first page.

Vaillant boiler fault codes 151 to 228 of 228

The code list is split over 2 pages. Looking for a specific code? Use the search on the first page: it searches all 228 codes in one go.

Code	Cause
F.49	eBUS undervoltage
F.49	eBUS fault
F.52	Mass flow sensor connection fault
F.53	Mass flow sensor fault
F.54	Gas pressure error in combination with F.28/F.29
F.54	Gas pressure error
F.56	Mass flow sensor control fault
F.57	No or too low gas inlet pressure,
F.57	Fault in the flue gas path
F.60	Electronics error
F.60 - F.67	Electronics defective
F.60 - F.69	Fault in the electronic controller
F.61	Gas valve unit defective
F.61	Gas valve control error
F.61	Gas valve actuation contains faults
F.62	Gas valve unit defective (gas solenoid valves do not close properly). Gas valve unit defective. Main PCB defective.
F.62	Gas valve switch-off delay does not work properly
F.62	Gas valve switch-off delay error
F.63	EEPROM defective
F.63	EEPROM error
F.63	EEPROM does not work properly
F.64	Flow-return sensor electronics measurement error
F.64	Fault in electronics/sensor
F.64	Electronics/NTC fault
F.65	Temperature in main PCB too high
F.65	Electronics temperature fault
F.65	Electronics temperature too high
F.66	Electronics error
F.67	Ionisation input signal is outside the limits of 0-5 V
F.67	Electronics/flame error
F.67	Flame monitoring input signal is outside the limits (0 or 5V)
F.68	Fluctuations in the ionisation signal
F.70	Communication fault between the display and the PCB
F.70	Invalid appliance ID (DSN)
F.70	No valid appliance variant for display and/or electronics
F.707	No communication between display and PCB
F.71	Flow sensor measures a constant value. Flow sensor defective.
F.71	Flow sensor reports a constant value
F.71	Flow temperature sensor error
F.72	Error message from flow sensor and/or return sensor
F.72	Flow sensor and/or return sensor fault
F.73	Pressure sensor open circuit. Pressure sensor wiring harness interrupted. Pressure sensor defective.
F.73	Water pressure sensor fault
F.73	Water pressure sensor error
F.73	Water pressure sensor signal in the wrong range (too low)
F.74	Pressure sensor short circuit
F.74	Water pressure sensor signal in the wrong range (too high)
F.74	Water pressure sensor error
F.75	No pressure jump is measured when the pump is switched on
F.75	Error: no pressure jump detection when the pump starts
F.75	No pressure jump was detected when the pump was switched on
F.76	Thermal fuse on the primary heat exchanger has tripped
F.76	Open circuit in wiring harness
F.76	Overheating protection on the primary heat exchanger has been activated
F.77	Problems with gas valve. Gas valve defective. Wiring harness defective. Main PCB defective.
F.77	Flue gas damper fault
F.77	Condensate pump or confirmation signal of fittings module central heating
F.77	Condensate pump or confirmation signal of fittings module central heating
F.78	Open circuit of hot water outlet sensor at the external controller
F.78	Wrong control module connected
F.80	Open circuit or short circuit of inlet sensor of secondary heat exchanger
F.81	actoSTOR charging pump defective;
F.82	Protective anode error actoSTOR K300
F.83	Boiling dry fault
F.84	Flow and return sensors swapped
F.85	Flow and return sensors fitted on the same pipe
F.86	Underfloor heating contact error
F.87	Ignition transformer open circuit
F.88	Gas valve fault
F.89	Pump error
F.90	Communication with the internal cylinder has been interrupted
F.905	Communication with CIM module has been interrupted
F.92	Gas coding resistor error
F.93	Gas group error
F.95	Gas group error
F.96	Gas group error
Emergency mode “Speed”	No speed signal from fan
con	No communication with the PCB

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