GW

Glow-worm Fault Codes

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

• F1 The F1 code appears on Glow Worm boilers when the boiler has attempted to light itself five times in a row without the… Read more →
• F22 The F22 fault code on a Glow-Worm boiler signals that the water pressure inside your central heating system has dropped… Read more →
• F28 The F28 code means your Glow-Worm boiler attempted to light the burner, failed to detect a flame after three ignition… Read more →
• F75 The F75 code appears when the boiler's pressure sensor fails to detect any change in water pressure at the moment the… Read more →