BoilerFaultCodes.com

Baxi 200 / 400 Combi Fault Codes

Combi Natural GasLPG 24-28 kW 2016-present
GC Numbers: 47-077-0447-077-0547-077-1247-077-1347-077-1447-077-15

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

Most common fault codes

E.00 – .04
Your boiler has detected a problem with the internal sensor that monitors water returning from your radiators, meaning it cannot safely regulate its temperature and has stopped working.
Gas Safe engineer required · £90-160
E.00 – .05
Your boiler has detected a fault with the sensor that monitors water temperature returning to the unit, meaning it cannot operate safely or efficiently.
Gas Safe engineer required · £90-160
E.01 – .02
Your boiler has detected that the water coming back from your radiators is hotter than the water leaving the boiler, which usually means water is flowing in the wrong direction or a sensor has developed a fault.
Gas Safe engineer required · £120-£280

All 42 fault codes

Code Severity Plain English
E.00 – .04 High Your boiler has detected a problem with the internal sensor that monitors water returning from your radiators, meaning it cannot safely regulate its temperature and has stopped working.
E.00 – .05 High Your boiler has detected a fault with the sensor that monitors water temperature returning to the unit, meaning it cannot operate safely or efficiently.
E.01 – .02 High Your boiler has detected that the water coming back from your radiators is hotter than the water leaving the boiler, which usually means water is flowing in the wrong direction or a sensor has developed a fault.
E.01 – .04 High Your boiler is struggling to keep its flame lit and has safely shut down after repeatedly failing to stay on.
E.01 – .11 High Your boiler's fan is not spinning at the correct speed, which is preventing the system from safely clearing exhaust fumes.
E.01 – .12 High Your boiler has stopped working because it believes the water returning to the unit is hotter than the water leaving it, which usually indicates a circulation problem or a sensor error.
E.01 – .17 High Your boiler has stopped working because water isn't moving through the system correctly or a internal sensor has lost its connection.
E.01 – .20 High Your boiler has switched itself off because it has become too hot inside, likely due to water not flowing correctly or a faulty internal sensor.
E.02 – .00 Low Your boiler is simply letting you know that the reset button has been held down or activated.
E.02 – .07 High Your boiler has detected that there is not enough water in the central heating system to operate safely.
E.02 – .16 High Your boiler has experienced an internal electronic failure or a communication error between its main control components.
E.02 – .17 High Your boiler's computer has lost touch with the internal components that control the gas flow, meaning it cannot safely light the burner.
E.02 – .19 High Your boiler's internal computer settings have been altered or are mismatched, which is preventing the system from operating correctly.
E.02 – .20 High Your boiler's internal computer settings have been altered or misconfigured, preventing it from operating correctly.
E.02 – .21 High Your boiler's electronic settings have been altered or are misconfigured, preventing it from operating correctly.
E.02 – .47 High Your boiler has detected a communication problem with your external thermostat or smart controls, meaning it cannot receive the command to turn on.
E.02 – .48 Medium Your boiler is having trouble talking to your wireless thermostat or smart controller, meaning it doesn't know when to turn the heating on.
E.04 – .00 High Your boiler has lost communication with the internal gas control system, meaning it cannot safely release fuel to create a flame.
E.04 – .01 High Your boiler has stopped working because it cannot correctly measure the temperature of the water leaving the unit due to a faulty internal sensor or wiring.
E.04 – .02 High Your boiler has stopped working because it can no longer accurately measure the temperature of the water leaving the unit.
E.04 – .03 High Your boiler has shut down because water is not moving through the system properly, causing it to overheat.
E.04 – .04 High Your boiler has detected an issue with the sensor that monitors exhaust gases, and it has locked the system down as a safety precaution.
E.04 – .05 High Your boiler has detected a problem with a safety sensor that monitors the temperature of the exhaust gases, causing the system to lock out.
E.04 – .06 High Your boiler has shut down because it is getting too hot inside, likely due to a lack of water flow or a faulty sensor safety check.
E.04 – .08 High Your boiler has shut down because it has detected it is getting too hot, likely due to a lack of water flow or a sensor failure.
E.04 – .10 High Your boiler is trying to start up but cannot light the gas flame to provide heating or hot water.
E.04 – .12 High Your boiler has detected a flame signal when there shouldn't be one, or it is running too hot to operate safely.
E.04 – .13 High Your boiler's fan, which safely pushes exhaust fumes away, has stopped spinning or cannot communicate with the system.
E.04 – .17 High Your boiler has detected a serious problem with its internal gas system and has shut down as a safety precaution.
H.01 – .00 High Your boiler has lost its internal connection to the main gas control unit, meaning it cannot safely manage the fuel it needs to fire up.
H.01 – .05 High Your boiler has detected that the water is heating up too quickly or isn't circulating properly through the system.
H.01 – .08 High Your boiler is overheating because water isn't moving through the system quickly enough to be cooled down.
H.01 – .14 High Your boiler has detected that it is getting too hot too quickly, usually because water isn't moving through the system properly.
H.01 – .18 High Your boiler has stopped working because water is not moving through the system properly or a temperature sensor has detected an overheating issue.
H.01 – .21 High Your boiler is heating up too quickly when you turn the tap on, which usually means water isn't flowing through the system fast enough to take the heat away.
H.02 – .02 High Your boiler's internal computer brain hasn't been set up with the correct identity settings, so it doesn't know how to operate correctly.
H.02 – .03 High Your boiler is temporarily confused by its internal software settings and cannot start up correctly.
H.02 – .04 High Your boiler's computer brain is momentarily confused by some internal settings and cannot operate correctly.
H.02 – .06 High Your boiler has detected that the water pressure is too low for it to operate safely, likely due to a small leak or air in the system.
H.03 -.00 High Your boiler has stopped working because its internal sensors or control system are struggling to talk to each other correctly.
H.03 – .01 High Your boiler's computer parts are having trouble talking to each other, which means the system cannot operate for heating or hot water.
H.03 – .02 High Your boiler has lost its flame while it was running, which means it has stopped providing heating and hot water for safety reasons.

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