Chaffoteaux Calydra 100 Fault codes & diagnostics

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

Combi Natural Gas 29.3 kW 1998-2005 Discontinued
GC Number 47-980-15

Replaced by: Chaffoteaux Britony Combi

Download the Chaffoteaux Calydra 100 manual The official installation & service manual (PDF) — the exact document these fault codes were verified against. PDF

The fault code is already on your display

Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →

Fault codes

All 1 documented codes

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40

Your boiler has stopped working because it cannot light the internal flame needed to heat your water.

High Engineer only £120-250

Parts commonly replaced

  • Ignition electrode
  • Gas valve
  • PCB

Related codes

Full explanation for 40
Status & diagnostic codes

4 operating states & engineer diagnostics

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

34 Status Your boiler is struggling to detect which setting you have chosen, meaning it cannot reliably switch between providing heating and hot water. 38 Status This code simply indicates that your boiler is switched on and operating in its normal standby state. 39 Status Your boiler is operating normally and the burner is currently lit, which is indicated by the orange light. 41 Diagnostic Your boiler has detected an internal error and has entered a safety lockout mode, which requires a manual reset to attempt to clear the fault.