Ideal Classic Se Fault codes & diagnostics

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

Regular Natural Gas 9-30 kW 1997-2007 Discontinued

Replaced by: Classic HE

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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Neon I3

Your boiler is receiving power, but this indicator light is just confirming that the electrical supply is turned on and the system is in standby.

Low DIY-safe

What to check first

  1. Check your thermostat or programmer to ensure a heating or hot water demand is active
  2. Ensure the central heating dial on the boiler front panel is turned up
  3. Verify that the boiler's external mode switch or timer is set to 'ON'
Full explanation for Neon I3
Neon SG1

Your boiler is currently trying to light its flame, which is a normal part of the start-up process that should stop once the burner is running.

Low Engineer only

Parts commonly replaced

  • Ignition lead
  • Ignition electrode
  • PCB
Full explanation for Neon SG1