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Verified boiler fault-code guides
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Vaillant · ecoFIT pure
- Vaillant F.10Short circuit: Flow temperature sensor
- Vaillant F.11Short circuit: Return temperature sensor
- Vaillant F.49eBUS fault: Voltage too low
- Vaillant F.63Fault: EEPROM
- Vaillant F.64Fault: Electronics / sensor / analogue-to-digital converter
- Vaillant F.65Fault: Electronics temperature too high
- Vaillant F.71Fault: Flow/return temperature sensor
- Vaillant F.72Fault: Deviation in the water pressure sensor/return temperature sensor
- Vaillant F.73Fault: Water pressure sensor not connected or has short-circuited
- Vaillant F.74Fault: Electrical problem in the water pressure sensor
- Vaillant F.84Fault: Flow/return temperature sensor
- Vaillant F.85Fault: Temperature sensor
- Vaillant F.22F.22 indicates low water pressure in the heating installation and the boiler has stopped to protect itself.
- Vaillant F.28F.28 indicates that the ecoFIT pure could not establish a flame after three ignition attempts and has entered fault mode.
- Vaillant F.00Fault: Flow temperature sensor
- Vaillant F.01Fault: Return temperature sensor
- Vaillant F.20Safety shutdown: Overheating temperature reached
- Vaillant F.23Safety shutdown: Temperature spread too great (NTC1/NTC2)
- Vaillant F.24Safety shutdown: Temperature rise too fast
- Vaillant F.32Fan frost protection function active: Fan speed outside the tolerance values
- Vaillant F.83Fault: Dry fire
- Vaillant F.25Safety shutdown: Flue gas temperature too high. The manual warns that some shared-table codes may not be visible on every product variant.
- Vaillant F.27Safety shutdown: Fault in flame detection (listed causes include a leaking gas solenoid valve). The manual warns that some shared-table codes may not be visible on every product variant.
- Vaillant F.61Fault: Gas valve assembly control. The manual warns that some shared-table codes may not be visible on every product variant.
- Vaillant F.62Fault: Gas valve switch-off control (listed causes include a leaking gas valve assembly and delayed extinguishing of the flame signal). The manual warns that some shared-table codes may not be visible on every product variant.
- Vaillant F.77Fault: Condensate or smoke (flue non-return flap defective). The manual warns that some shared-table codes may not be visible on every product variant.
- Vaillant F.29F.29 indicates flame loss.
- Vaillant F.75F.75 indicates a defective pressure switch.
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