Warmflow Kabin Pak and Utility Fault codes & diagnostics

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

CombiSystemHeat Only Oil 1995-2018 Discontinued
Download the Warmflow Kabin Pak and Utility manual The official installation & service manual (PDF) — the exact document these fault codes were verified against. PDF

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Fault codes

All 1 documented codes

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Burner control box lockout light lit

Your boiler's burner has shut itself down for safety because it failed to light or maintain a flame.

High DIY-safe £120-280

What to check first

  1. Check that you have plenty of oil in your storage tank
  2. Ensure the oil supply valves are fully open
  3. Firmly press the illuminated reset button on the burner once to restart

Parts commonly replaced

  • Oil nozzle
  • Photocell
  • Oil pump
  • Burner control box

Related codes

Full explanation for Burner control box lockout light lit
Status & diagnostic codes

1 operating states & engineer diagnostics

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

FSK1 Diagnostic Your boiler has detected that the external frost protection kit has been triggered, which means the system is attempting to protect itself from freezing temperatures.