Glow-worm Fault Codes

Select a fault code to see its meaning, common causes and how to fix it.

F-series fault codes

Flashing-light & LED patterns (display-less models)

Green LED Off On Glow-Worm boilers that use LED status indicators rather than a digital display — most notably the Betacom range —… Read more →
Red LED Flashing On Glow-Worm Betacom series boilers, a flashing red LED is the boiler's way of signalling an overheat condition. Unlike… Read more →
Red LED On On older Glow-Worm boilers — particularly the Betacom range — faults are communicated through LED indicators rather… Read more →
Temperature 30 Flashing On Glow-Worm boilers, a flashing temperature reading of around 30°C is most often a completely normal display behaviour… Read more →
Temperature 40 Flashing On older Glow-Worm boilers that use a row of temperature indicator lights (typically 30, 40, 50, 60, 70 °C) rather than… Read more →
Temperature 50 Flashing When the display on a Glow-Worm Betacom C boiler flashes 'Temperature 50', it is signalling a fault detected on the… Read more →
Temperature 60 Flashing On the Glow Worm Betacom C range, a flashing '60' on the display is the boiler's way of telling you that system water… Read more →
Temperature 70 Flashing When your Glow-Worm boiler's display shows a flashing '70' or a flashing temperature/radiator symbol at 70°C, it is… Read more →
Temperature 80 Flashing On Glow-Worm Betacom C series boilers, seeing the temperature display flashing at 80 — typically accompanied by a red… Read more →
Temperature 90 Flashing On the Glow Worm Betacom c range, the boiler does not use alphanumeric fault codes in the conventional sense — instead,… Read more →
Yellow LED Flashing On Glow-Worm Betacom boilers, which use LED indicators rather than a digital display, a flashing yellow (amber) LED is… Read more →