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What is the Vaillant boiler F.01 fault / error code?

3 Answers

Answered by S Banks Plumbing Heating & Eco Energies Ltd

3rd October 2019

S Banks Plumbing Heating & Eco Energies Ltd answered the question "What is the Vaillant boiler F.01 fault / error code?"

The error code F01 for a vaillant boiler is a fault on the return sensor. This can be either the sensor itself, or a fault with the wiring. This can be checked with electrical tester as sometime open circuit or a diminished reading. Check the wiring to this also as I've found cables being pinched and damaged or not connected to the sensor properly causing issues.

Answered by BoilerOne

25th May 2019

BoilerOne answered the question "What is the Vaillant boiler F.01 fault / error code?"

A vaillant boiler with an error code F.01 relates to a faulty thermistor on the heating return, we would test the thermistor itself and test the cables from the pcb also looking for any damaged cables or loose connections. BoilerOne recommend you consult a gas safe registered engineer to diagnose the problem.

Answered by Landlord & Homeowner Gas Services

9th February 2019

Landlord & Homeowner Gas Services answered the question "What is the Vaillant boiler F.01 fault / error code?"

Hi I’m Greg from Landlord & Homeowner Gas Services. The F.01 fault code on a Vaillant boiler is likely due to an open circuit in the return sensor. The likely causes are the following: NTC defective NTC cable defective Defective plug connection on NTC Defective plug connection on electronics. Thanks Greg Landlord & Homeowner Gas Services

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