25 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
Replaced by: Baxi Platinum Combi HE
This boiler uses LED flash patterns
Count the flashes in one repeating group before the pause. That number is your fault code. Do not reset until you have noted it. How to read fault codes →
The GC number on your boiler's data badge identifies the exact appliance and production years, as recorded in the UK Product Characteristics Database.
| GC number | Appliance (register name) | Produced |
|---|---|---|
| 47-075-17 | Combi Instant 80 HE | 2004–2008 |
| 47-075-19 | System 60/100 | 2001–2005 |
| 47-075-09 | Combi Instant 105 e | 2001–2011 |
Tap any card for details
Your boiler's temperature sensor is providing incorrect readings, which prevents the unit from heating your water or home correctly.
Your boiler is trying to start but failing to stay lit, which means you currently have no heating or hot water.
Your boiler is struggling to move water around your heating system, which has caused it to shut down to prevent internal damage.
Your boiler's safety system has detected an issue with the airflow inside the unit, causing it to shut down to prevent unsafe operation.
Your boiler is failing to detect that water is moving through it, meaning it will not start up to provide heating or hot water.
Your boiler has detected that it is running too hot or that the exhaust system is blocked, so it has safely shut itself down to prevent damage.
Your boiler has stopped working because it is unable to accurately measure the temperature of the water inside, which prevents the unit from starting up safely.
Your boiler is attempting to start but cannot successfully ignite the flame required to produce heat or hot water.
Your boiler is struggling to clear exhaust gases properly because the fan isn't spinning fast enough to vent them safely, so it has stopped working as a precaution.
Your boiler is struggling to circulate water properly, which is preventing it from heating your home or water safely.
Your boiler is failing to light the burner because it cannot generate the electrical spark needed to ignite the gas.
Your boiler is failing to light the internal flame, which means it cannot produce hot water or heating for your home.
Your boiler has detected that it is getting too hot and has automatically switched itself off to prevent damage or fire risk.
Your boiler has stopped working because it cannot detect the water circulating inside, meaning it is preventing itself from firing up to stay safe.
Your boiler is failing to clear combustion gases properly, which prevents it from starting to protect you from potentially harmful fumes.
Your boiler's internal computer is failing to communicate correctly, which has caused it to shut down for safety reasons.
Your boiler has attempted to light the burner but failed to detect a flame, causing it to shut down for safety precautions.
Your boiler has stopped working because it cannot light the flame or clear away waste water properly.
Your boiler has detected that it is dangerously hot and has shut itself down to prevent damage or a potential fire hazard.
Your boiler has detected an issue with the system that blows out waste gases, meaning it has safely shut down to prevent unsafe operation.
Your boiler has stopped working because it either doesn't have enough water inside the system to operate safely or the internal water pump is failing to move the water around.
Your boiler is struggling to detect the temperature of your hot water, which means it will likely stop providing hot water to your taps and shower.
Your boiler has stopped working because it is unable to accurately measure the temperature of the water used for your radiators.
Your boiler is having trouble 'reading' the temperature of the water returning to it, so it has safely shut down to prevent overheating.
Your boiler has stopped working because it cannot light the flame required to heat your water and radiators.
Not faults — these are normal operating states. Tap to expand.
BoilerFaultCodes