Ideal Classic 24 Fault codes & diagnostics

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

Combi Natural Gas 2014-present
GC Number 47-349-07
Download the Ideal Classic 24 manualThe official installation and service manual (PDF), the document these fault codes were read from. PDF
Other editions of this manual (the one above is UIN 212135 A06): UIN 212135 A04 (PDF) Manufacturers revise a model over the years. If your boiler is older than the manual above, an earlier edition may match it better.

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 2 documented codes

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C0

Your boiler's internal memory chip is not communicating correctly with the main computer, preventing the boiler from starting safely.

High Engineer only £150-250

Parts commonly replaced

  • Boiler Control Card (BCC)
  • Wiring harness

Related codes

Full explanation for C0
C2

Your boiler has stopped working because a small electronic identification chip is either missing or has not been properly set up on the control board.

High Engineer only £100-250

Parts commonly replaced

  • Boiler Control Calibration Chip (BCC)
  • PCB (Printed Circuit Board)

Related codes

Full explanation for C2
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