F.61 High

Glow-worm F.61 Fault Code

Also written as F61 — same fault.

The Glow-worm F.61 fault code means: your boiler has detected a communication error with the gas valve, preventing it from safely lighting the burner for heating and hot water.. It appears on 6 Glow-worm 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: Gas valve control system fault

What causes the Glow-worm F.61 fault?

This fault occurs when the boiler's main control board loses the ability to send or receive signals from the gas valve. The most common reason is an internal electronic failure within the gas valve itself or a fault on the circuit board that prevents it from safely controlling the fuel supply.

Typical repair cost £180-450 (including labour)

Engineer required

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

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Glow-worm models that show the F.61 fault code

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

Source

Glow-worm F.61 fault code information on this page is sourced and cross-checked against the official Glow-worm service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026