Ideal Harrier GT Fault codes & diagnostics

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

Regular Natural Gas Discontinued
Download the Ideal Harrier GT 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

Tap any card for details

S3

Your boiler has detected an issue during the ignition process and has shut itself down for safety, meaning you currently have no heating or hot water.

High Engineer only £150-350

Parts commonly replaced

  • Burner Control Box
  • Ignition Electrode
  • Gas Valve
Full explanation for S3