Sime Ecomfort Plus HE Fault codes & diagnostics

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

CombiSystem Natural Gas 2005-2014 Discontinued
GC Numbers 41-283-1047-283-13
Download the Sime Ecomfort Plus HE manualThe official installation and service manual (PDF), the document these fault codes were read from. PDF

This boiler uses LED flash patterns

Count the flashes in one repeating group before the pause. That number is your fault code. Do not reset until you have noted it. How to read fault codes →

Fault codes

All 1 documented codes

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Flashing orange LED

Your boiler is struggling to detect a flame, which means it will shut down for safety to prevent gas from flowing without being burned.

High Engineer only £120-£240

Parts commonly replaced

  • Ignition electrode
  • Detection (ionisation) electrode
  • Ignition lead
  • Gas valve

Related codes

Full explanation for Flashing orange LED
Status & diagnostic codes

4 operating states & engineer diagnostics

Not faults — these are normal operating states. Tap to expand.

G20 Diagnostic Your boiler is displaying a technical configuration code indicating it is calibrating or checking the gas pressure supply to the burner. G30 Diagnostic Your boiler is struggling to correctly adjust the amount of gas it uses to heat your home, meaning it cannot operate safely or efficiently. G31 Diagnostic Your boiler is detecting an issue with the pressure of the gas being supplied to the burner, which is preventing it from firing up safely. JP4 Diagnostic Your boiler has detected an incorrect fuel type setting for the gas supply it is receiving, which prevents it from igniting safely.