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What is the Vaillant boiler F.11 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.11 fault / error code?"

A vaillant boiler with an error code of F11 is due to the return NTC or a short circuit on the cable harness / NTC defective or a short the the casing/cable. This can be checked out with electrical tester. Always ensure a that on full service all cables are checked for kinks and loose connections.

Answered by BoilerOne

25th May 2019

BoilerOne answered the question "What is the Vaillant boiler F.11 fault / error code?"

A vaillant boiler with an error code F.11 relates to a short circuit to the 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.11 fault / error code?"

Hi I’m Greg from Landlord & Homeowner Gas Services. The F.11fault code on a Vaillant boiler is likely due to a short circuit in the return sensor. The likely causes are the following: - Plug on sensor has short circuit to ground on casing. - Short circuit in cable harness - Defective sensor Please ensure all work is carried out by a gas safe registered engineer. Thanks Greg Landlord & Homeowner Gas Services

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