Warmflow 70/90 Combi Fault codes & diagnostics

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

Combi Oil 1995-2015 Discontinued
Download the Warmflow 70/90 Combi 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 stay lit.

High DIY-safe £120-280

What to check first

  1. Check that you have enough oil in your storage tank.
  2. Ensure the oil supply valves are fully open.
  3. Press the illuminated reset button on the burner control box once.

Parts commonly replaced

  • Oil nozzle
  • Photocell
  • Fuel pump
  • Ignition transformer

Related codes

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

18 operating states & engineer diagnostics

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

281 Diagnostic Your boiler has detected that it is overheating and has automatically switched itself off to prevent damage to the system. 599 Diagnostic Your boiler is struggling to transfer heat to your hot water taps, which likely means the internal water-heating component has become clogged with debris or limescale. 602 Diagnostic Your boiler's water circulation pump is struggling or has failed, meaning your heating and hot water will not work correctly. 614 Diagnostic Your boiler is struggling to automatically release trapped air from the system, which can cause noisy pipes and inefficient heating. 1476 Diagnostic Your boiler is failing to detect that water is moving through the system, which prevents it from igniting to provide you with hot water. 1621 Diagnostic Your boiler is struggling to correctly blend the temperature of your hot water, which will likely result in your taps running cold or lukewarm. 1827 Diagnostic Your boiler has detected an internal electrical switching fault which is preventing it from safely starting up. 2126 Diagnostic Your boiler has detected that the water inside the unit has become dangerously hot and has shut itself down to prevent damage or overheating. 2128 Diagnostic Your boiler's internal expansion vessel has lost its air pressure, which means it cannot safely manage the pressure changes in your heating system as it warms up. 2130 Diagnostic Your boiler's water circulation pump is experiencing a communication or performance error, which is preventing hot water and heating from moving through your home. 2131 Diagnostic Your boiler's temperature sensor is failing to communicate correctly, which has caused the system to stop providing heating and hot water as a safety precaution. 2132 Diagnostic Your boiler is detecting that it is under too much internal pressure, which is causing a safety mechanism to release excess water to prevent damage. 2133 Diagnostic Your boiler is telling you that the internal water pressure is too low for it to operate safely and needs to be topped up. 2169 Diagnostic Your boiler is struggling to accurately read or maintain the water pressure inside your heating system due to a fault with the internal pressure sensing device. 2270 Diagnostic Your boiler has stopped working because the water pressure inside the heating system has dropped too low to operate safely. 2419 Diagnostic Your boiler's main computer board is failing to communicate correctly, which has caused the system to shut down for safety. 2508 Diagnostic Your boiler has detected that the temperature inside is near freezing and has temporarily activated its internal safety mode to prevent the pipes from freezing. R7627 Diagnostic The control panel button used to restart your boiler is stuck or failing to register, preventing the system from firing up properly.