Glow-worm 30cxi Fault codes & diagnostics

1 fault code with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.

Combi Natural Gas 30 kW 2002-present
GC Number 47-047-24
Download the Glow-worm 30cxi manualThe official installation and service manual (PDF), the document these fault codes were read from. PDF

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Fault codes

All 1 documented codes

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F5

Your boiler has temporarily stopped working because trapped air inside the system has caused it to get too hot.

High Engineer only £90-180

Parts commonly replaced

  • Overheat thermostat
  • Automatic air vent
  • Circulating pump

Related codes

Full explanation for F5
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