BoilerFaultCodesGlow-worm F.97 Fault Code
Also written as F97 — same fault.
The Glow-worm F.97 fault code means: your boiler's computer has detected an internal error while running its own system health check and has safely stopped working to prevent further issues.. It appears on 10 Glow-worm models in our database.
Technical description: Fault: Main PCB self-test failed
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 →Avoid the next call-out bill
A cover plan would handle faults like F.97: no call-out fees, no surprise bills.
Affiliate links. We may earn a commission at no extra cost to you.
Glow-worm models that show the F.97 fault code
Click a model for the full fault code list and model-specific repair notes.
- Compact Repair: £250-450
- Easicom3 Combi Repair: £250-450
- Easicom3 System Repair: £250-450
- Energy7 Combi Repair: £300-500
- Energy7 Regular Repair: £300-500
- Energy7 System Repair: £300-550
- Flexicom 24c / 28c Repair: £250-400
- MicraCom Repair: £250-450
- Ultimate3 Combi Repair: £300-500
- Ultimate3 System Repair: £250-450
Source
Glow-worm F.97 fault code information on this page is sourced and cross-checked against the official Glow-worm service / installation manuals for each affected model.
- Glow-worm Compact manual (PDF)
- Glow-worm Easicom3 Combi manual (PDF)
- Glow-worm Easicom3 System manual (PDF)
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 7 July 2026