Baxi Bahama 100 Fault codes & diagnostics

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

Combi Natural Gas 29 kW 2000-2006 Discontinued
Download the Baxi Bahama 100 manual The official installation & service manual (PDF) — the exact document these fault codes were verified against. PDF

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Fault codes

All 2 documented codes

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Flame Failure

Your boiler has stopped working because it couldn't light the flame or keep it burning, so it has purposefully shut itself down for safety.

High Engineer only £120-250

Parts commonly replaced

  • Ignition electrode
  • Gas valve
  • Printed Circuit Board (PCB)
  • Flame rectification probe
Full explanation for Flame Failure
Red Light

Your boiler has stopped working because it has detected an internal overheating issue or a failure to light the burner as a safety precaution.

High Engineer only £120-250

Parts commonly replaced

  • Overheat Thermostat
  • Ignition Electrode
  • Gas Valve
  • PCB
Full explanation for Red Light
Status & diagnostic codes

9 operating states & engineer diagnostics

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

10 Diagnostic Your boiler is failing to detect the flame needed to heat your water or home, causing it to shut down for safety reasons. 15 Diagnostic Your boiler has detected a problem with the gas valve or the electrical supply to it, preventing the burner from igniting properly. 20 Diagnostic Your boiler is not detecting the water flow it needs to safely fire up, which may be caused by a blockage, an airlock, or a failing sensor. 40 Diagnostic Your boiler is failing to detect a flame or is not heating up, which has caused it to automatically shut down for your safety. 60 Diagnostic Your boiler has detected a problem with the flow of water or heat inside the system and has safely shut itself down to prevent damage. 80 Diagnostic Your boiler is failing to detect the flame needed to heat your water and home, which is causing it to shut down for safety. 95 Diagnostic Your boiler has detected a fault with the main internal control board, meaning it cannot safely regulate the heating and hot water system. Green Light Status Your boiler is working normally and simply letting you know that it is powered on and ready to provide heating or hot water. Orange Light Status Your boiler is working exactly as it should and is currently burning gas to heat your water or radiators.