BoilerFaultCodes.com

Keston C36 Fault Codes

Combi Natural Gas 36 kW 2007-2013 Discontinued
GC Number: 47-196-01

Replaced by: Combi C35

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Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →

Most common fault codes

E01
Your boiler has tried to light itself several times without success, meaning your heating and hot water will not work until it is reset or repaired.
May be DIY safe · £100-350
E02
Your boiler thinks a flame has started when it shouldn't have, usually caused by an electrical glitch or a faulty sensor signal.
Gas Safe engineer required · £120-350
E03
Your boiler has become too hot and has shut itself down as a safety precaution to prevent damage.
May be DIY safe · £100-£350

All 28 fault codes

Code Severity Plain English
E01 High Your boiler has tried to light itself several times without success, meaning your heating and hot water will not work until it is reset or repaired.
E02 High Your boiler thinks a flame has started when it shouldn't have, usually caused by an electrical glitch or a faulty sensor signal.
E03 High Your boiler has become too hot and has shut itself down as a safety precaution to prevent damage.
E05 High Your boiler has stopped working because the internal fan, which safely exhausts fumes, is not spinning correctly or cannot be detected by the system.
E07 High Your boiler has shut down because the internal exhaust gases are getting too hot, which is usually caused by a circulation problem or a buildup of debris inside the main heating component.
E08 High Your boiler is having trouble managing the flame and electrical signals, which is preventing it from heating your home safely.
E09 High Your boiler has detected an internal communication problem between its electronic brain and the gas supply system, meaning it cannot safely light the flame.
E10 High Your boiler’s internal computer has encountered a critical electronic failure and cannot safely operate the system.
E11 High Your boiler has stopped working because its internal sensors are reporting conflicting temperature readings that don't match up during a self-test.
E23 High Your boiler has stopped working because it cannot correctly detect the water pressure, often due to a low water level or a faulty sensor.
E24 High Your boiler has shut down because it keeps losing water pressure and likely has a leak somewhere in the heating system or the unit itself.
E25 High Your boiler's internal computer has encountered a critical error and cannot safely operate the system.
E26 High Your boiler is struggling to keep its flame lit, which often happens because the drainage pipe is blocked or frozen, or there is an issue with the air supply.
E30 High Your boiler has detected an electrical fault with the internal sensor that monitors water temperature, causing the system to stop working for safety.
E31 High Your boiler has lost communication with the internal sensor that monitors the temperature of the water leaving the unit, usually due to a loose wire or a faulty part.
E32 High Your boiler has lost its ability to regulate hot water temperature correctly because of a wiring or sensor fault, meaning you likely have no hot water.
E33 Medium Your boiler is having trouble measuring the temperature of your hot water because of a faulty internal sensor or a wiring issue.
E34 High Your boiler has stopped working because it isn't receiving enough electricity from your home's power supply to run safely.
E35 High Your boiler is struggling to detect a stable electrical signal from the mains power supply, causing it to shut down as a safety precaution.
E37 High Your boiler has detected that the water pressure is too low, which has caused it to stop working to avoid damage.
E38 High Your boiler's control panel has developed a mechanical or electrical fault with the reset button, meaning it cannot process your commands correctly.
E40 Emergency Your boiler has switched off because there is too much water pressure in the system, which can put unnecessary strain on the internal seals.
E41 High Your boiler's main control panel is having trouble talking to the internal computer, which is preventing the system from starting up.
E43 High Your boiler has detected an electrical fault with the internal sensor that monitors the temperature of the water returning to the unit, causing it to shut down for safety.
E44 High Your boiler has lost communication with the sensor that monitors water returning from your radiators, often causing the system to stop working as a safety precaution.
E45 High Your boiler has detected an electrical fault with the sensor that monitors exhaust gases, causing the system to shut down for safety.
E46 High Your boiler's main control panel has lost connection with the internal computer that runs it, meaning the boiler cannot receive commands.
E99 High Your boiler has detected an electrical fault with the sensor that monitors the temperature of the exhaust gases, causing the system to shut down for safety.

Keston C36 is discontinued — time for a new one?

Parts for discontinued models can be hard to find and expensive. A new A-rated boiler could save you money on both repairs and energy bills.

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