BoilerFaultCodesGlow-worm F.75 Fault Code
Also written as F75 — same fault.
The Glow-worm F.75 fault code means: your boiler is struggling to push water around your heating system, likely because the internal pump is stuck, failing, or there is an issue with the sensor that detects water pressure.. It appears on 19 Glow-worm models in our database.
Technical description: Precise information about circulation fault: 1=Pump blocked, 2=Electrical pump fault, 3=Pump dry run, 5=Pressure sensor fault, 6=No feedback from the pump, 7=Incorrect pump detected, 8=Flow rate at the end of the purge programme is insufficient
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.75 fault code
Click a model for the full fault code list and model-specific repair notes.
- Betacom4 Repair: £150-250
- Compact Repair: £180-350
- Easicom 2 24c Repair: £150-250
- Easicom3 Combi Repair: £150-250
- Easicom3 System Repair: £120-250
- Energy Repair: £150-250
- Energy System Repair: £150-250
- Energy2 30c Repair: £120-250
- Energy7 Combi Repair: £150-250
- Energy7 System Repair: £150-250
- Essential Repair: £150-250
- MicraCom Repair: £150-350
- Sustain 12s Repair: £180-350
- Sustain 15s Repair: £180-350
- Sustain 18s Repair: £180-350
- SUSTAIN 30c Repair: £150-250
- SUSTAIN 35c Repair: £150-250
- Ultimate 3 25R Repair: £150-250
- Ultimate3 Combi Repair: £150-250
Source
Glow-worm F.75 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 31 August 2026