F.92 High

Vaillant F.92 Fault Code

Also written as F92 — same fault.

The Vaillant F.92 fault code means: your boiler has detected that the fuel type it is being supplied with does not match its internal settings, causing it to shut down for safety.. It appears on 15 Vaillant models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Incorrect gas type (referenced in status code S.61)

What causes the Vaillant F.92 fault?

This fault occurs when the boiler's internal sensors detect that the gas being burned does not match the settings programmed into the control board. The most common reason is a communication error or mechanical failure within the gas valve or the venturi assembly, which prevents the boiler from regulating the fuel mix correctly. In some cases, it can be triggered after a new installation if the engineer has not correctly configured the boiler for the specific type of gas in your area.

Typical repair cost £100-£450 (including labour)

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

Find a Gas Safe engineer

Search the official register for a qualified engineer in your area.

Gas Safe Register →
Boiler cover options

Avoid the next call-out bill

A cover plan would handle faults like F.92: no call-out fees, no surprise bills.

Approved partner
Domestic Appliance Guard
Unlimited call-outs, 24/7 helpline, no price-hike promise
Get a quote →

Affiliate links. We may earn a commission at no extra cost to you.

Vaillant models that show the F.92 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Vaillant F.92 fault code information on this page is sourced and cross-checked against the official Vaillant service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 31 August 2026