Source-backed catalogue
Verified boiler fault-code guides
Choose a supported model and code to read the catalogue entry and its source documents.
Glow-worm · Energy
- Glow-worm F.20Safety switch-off: the overheating temperature has been reached.
- Glow-worm F.22Safety switch-off: low water pressure in the boiler.
- Glow-worm F.23Safety switch-off: the temperature difference between sensors NTC1 and NTC2 is too great.
- Glow-worm F.24Safety switch-off: the temperature is rising too quickly.
- Glow-worm F.28The boiler was unable to ignite successfully when starting.
- Glow-worm F.29The flame has been lost.
- Glow-worm F.49eBUS fault: Voltage too low.
- Glow-worm F.64Fault: Electronics / sensor / analogue-to-digital converter.
- Glow-worm F.65Fault: Electronics temperature too high.
- Glow-worm F.00Fault: Flow temperature sensor.
- Glow-worm F.01Fault: Return temperature sensor.
- Glow-worm F.10Short circuit: Flow temperature sensor.
- Glow-worm F.11Short circuit: Return temperature sensor.
- Glow-worm F.63Fault: EEPROM.
- Glow-worm F.73Fault: Water pressure sensor not connected or short-circuited.
- Glow-worm F.75F.75 indicates a pressure sensor fault.
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