49 fault codes with plain-English explanations, severity ratings, DIY guidance, and repair cost estimates.
The fault code is already on your display
Note it down before pressing reset — resetting clears the code immediately. 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 |
|---|---|---|
| 47-116-17 | Ecogenus 24 MFFI | 2000–2002 |
Appliance names and production years are taken from the UK Product Characteristics Database (the SAP/SEDBUK register). Where a GC number is also printed in this model's own manufacturer manual, both sources were checked to agree.
Tap any card for details
Your boiler has detected that it is getting too hot and has automatically shut itself down to prevent internal damage.
Your boiler has failed to light the flame after trying three times, meaning it cannot produce any heat or hot water.
Your boiler has tried multiple times to start but failed to produce a flame, so it has safely shut itself down to prevent a gas buildup.
Your boiler is struggling to stay lit and has failed to maintain a flame multiple times, causing it to lock itself out for safety.
Your boiler has detected that a flame is still burning inside even though it has commanded the gas supply to shut off.
Your boiler has detected a flame signal when it shouldn't be there, which indicates a potential issue with the internal safety sensors or the electrical controls.
Your boiler is failing to register that it has cleared its internal air safely, meaning it is preventing itself from igniting for your protection.
Your boiler is failing to detect that the internal flue fan is starting up, which prevents the unit from firing up to provide heating or hot water.
Your boiler's internal mechanism for clearing waste gases is not working correctly, which forces the boiler to shut down for your safety.
Your boiler's computer is experiencing a communication error or internal glitch, preventing it from operating reliably.
Your boiler has failed to light the flame after repeated attempts and has safely shut itself down to prevent a gas buildup.
Your boiler is failing to ignite because it cannot detect that the flames have successfully warmed up the water inside the system after three attempts.
Your boiler has detected that the water inside is dangerously overheating and has shut itself down to prevent damage.
Your boiler has tried and failed to light the gas flame several times, so it has safely shut itself down to prevent a build-up of unburnt gas.
Your boiler is detecting a flame even when it believes the gas supply has been turned off, which is a safety concern regarding the gas control system.
Your boiler has detected a flame signal even though it hasn't turned the gas on yet, which indicates a serious internal electronic or safety sensor fault.
Your boiler is failing to detect the water flowing through it, which prevents it from igniting to heat your home or water.
Your boiler thinks water is still flowing through it even though the heating or hot water has been turned off, causing it to shut down to prevent damage.
Your boiler is struggling to clear exhaust gases properly, which has triggered a safety shut-off to prevent the system from operating incorrectly.
Your boiler's internal computer is experiencing a communication error, meaning it has temporarily stopped working because it cannot properly check its own safety systems.
Your boiler has detected an abnormally high temperature inside the system even though it is not currently trying to heat your home or water.
Your boiler is failing to ignite the flame needed to heat your water and radiators, despite a few automatic attempts to start.
Your boiler has detected that the water inside the system is getting too cold and has switched on its internal pump to keep the water moving and prevent freezing.
Your boiler has detected that the water level inside the heating system is too low to operate safely.
Your boiler has detected that a flame is present even though it has commanded the gas supply to shut off, which indicates a serious safety monitoring fault.
Your boiler has detected that the electricity supply wires are connected in the wrong order, preventing it from starting safely.
Your boiler is failing to detect the airflow needed for safe operation, so it has shut down to prevent any risk.
Your boiler has detected that the internal exhaust fan is not spinning fast enough to remove combustion gases safely, so it has shut down to prevent a hazard.
Your boiler is struggling to switch between heating your home and heating your hot water because an internal valve is sticking.
Your boiler is struggling to accurately measure the temperature of the water being stored or prepared, which is preventing it from heating your home or taps correctly.
Your boiler has lost the ability to accurately measure the temperature of the water being stored for your taps, causing it to stop heating water to prevent a potential malfunction.
Your boiler has lost the signal from the sensor that measures how hot the water inside the unit is, so it has shut down as a precaution.
Your boiler is currently unable to read the water temperature accurately, so it has shut down as a precaution to prevent overheating.
Your boiler is struggling to read its own internal water temperature, so it has shut down as a precaution to prevent overheating.
Your boiler's temperature sensor is sending a faulty signal, which prevents the system from accurately measuring how much heat is returning to the unit and stops it from operating.
Your boiler's main computer control panel is experiencing a general communication error, causing the entire system to stop working.
Your boiler has detected that the water inside it is dangerously hot even though it is not currently trying to heat your home.
Your boiler has lost the signal from the sensor that measures the hot water temperature, which will likely stop your taps from running hot.
Your boiler's hot water sensor is sending an incorrect signal, which means the system cannot accurately measure or heat your tap water.
Your boiler has lost the signal from the sensor that monitors the temperature of your underfloor heating pipework.
Your boiler has detected a flame signal when it is not trying to burn gas, which suggests a sensor issue or a potential internal safety fault.
Your boiler has detected that the electrical wires providing power to it have been installed in the wrong order, meaning the live and neutral connections are reversed.
Your boiler is struggling to detect a consistent electricity supply, which is forcing the system to shut down to prevent potential damage.
Your boiler is failing to light the burner because it cannot accurately tell if a flame is present due to an electrical connection issue.
Your boiler has lost the signal from the sensor that monitors the temperature of the water circulating through your radiators, causing it to stop working for safety reasons.
Your boiler has lost the signal from one of its internal temperature sensors, which is preventing it from safely heating your home.
Your boiler has stopped working because it is receiving an inaccurate electronic signal regarding the temperature of the water inside it.
Your boiler has detected a faulty sensor reading in the pipework that carries water back into the unit, forcing it to shut down to prevent damage.
Your boiler has detected a general internal fault with its main computer system, meaning it has safely shut down to prevent further damage.
BoilerFaultCodes