24 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
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 |
|---|---|---|
| 47-047-01 | Energysaver Combi 80 | 1998–2003 |
Tap any card for details
Your boiler is signalling that it has encountered an internal error and has stopped operating to prevent further damage.
Your boiler has detected a signal suggesting a flame is burning when it shouldn't be, which is a safety lockout preventing the unit from operating.
Your boiler is failing to start because it cannot confirm that the internal fan is effectively clearing exhaust gases, which prevents it from igniting safely.
Your boiler has stopped working because the water pressure inside the system has dropped too low to operate safely.
Your boiler has lost its electrical power supply or experienced a sudden interruption, causing it to shut down safety.
Your boiler's internal computer has encountered a critical error and can no longer control the heating and hot water functions safely.
Your boiler's main internal computer has developed a serious technical error and can no longer control the heating process safely.
Your boiler's main electronic brain has encountered an internal error and cannot communicate properly with the rest of the system, meaning the boiler has shut down for safety.
Your boiler's main internal computer has developed a malfunction and is no longer able to control the heating process safely.
Your boiler’s main computer brain has developed an internal electrical error and has stopped the unit from working for safety.
Your boiler's main internal computer has encountered a critical error and is unable to operate the system safely.
Your boiler's main internal computer has developed a software or hardware failure and can no longer control the heating and hot water.
Your boiler's main control computer has developed an internal electrical fault and can no longer safely operate the system.
Your boiler has sensed that the water inside is getting much too hot and has shut down as a safety precaution.
Your boiler has shut down because the water returning from your radiators is getting too hot, indicating a potential blockage or pump issue.
Your boiler's temperature sensors have been swapped during installation or maintenance, causing the system to get confused about which pipe is heating up.
Your boiler is heating up much faster than it should and has shut down to prevent itself from overheating.
Your boiler's electronic brain has developed a software or hardware error and can no longer control the heating and hot water safely.
Your boiler has stopped working because the internal fan, which safely exhausts fumes, is not spinning correctly or communicating with the system.
Your boiler has stopped working because the internal fan that moves waste gases out of the flue is not spinning.
Your boiler detects a flame when it shouldn't, which is causing it to shut down for safety.
Your boiler has detected a fault with a temperature sensor and has shut down as a safety precaution, meaning you currently have no heating or hot water.
Your boiler has detected a fault with the sensor that monitors water temperature returning from your radiators, preventing the system from heating up properly.
Your boiler has stopped working because a sensor that measures the temperature of the water heading to your radiators is sending an incorrect or broken signal.
BoilerFaultCodes