BoilerFaultCodesGlow-worm F67 Fault Code
The Glow-worm F67 fault code means: your boiler's internal computer boards have stopped communicating correctly, meaning the system cannot process commands or operate safely.. It appears on 9 Glow-worm models in our database.
Technical description: Main PCB / Display PCB fault
What causes the Glow-worm F67 fault?
This fault occurs when the boiler's internal computer chips fail to recognize or communicate with each other, often due to a hardware malfunction or a breakdown in the electronic circuitry. The most common reason is a voltage surge or general component wear that scrambles the software, preventing the boiler from performing its safety checks.
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 →Glow-worm models that show the F67 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Glow-worm F67 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