BoilerFaultCodes.com

Potterton Promax Combi HE Plus Fault Codes

Combi Natural Gas 24-33 kW 2011-2015 Discontinued
GC Numbers: 47-393-2747-393-2847-393-29

Replaced by: Promax Ultra Combi

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

Most common fault codes

20
Your boiler has detected an internal sensor failure and has stopped providing hot water or heating to protect the system.
Gas Safe engineer required · £90-160
28
Your boiler has stopped working because its internal computer board is either the wrong version for this model or has been configured incorrectly.
Gas Safe engineer required · £250-£450
50
Your boiler has detected a problem with the sensor that monitors the temperature of the exhaust gases, and it has likely shut down as a safety precaution.
Gas Safe engineer required · £100-£190

All 20 fault codes

Code Severity Plain English
20 High Your boiler has detected an internal sensor failure and has stopped providing hot water or heating to protect the system.
28 High Your boiler has stopped working because its internal computer board is either the wrong version for this model or has been configured incorrectly.
50 High Your boiler has detected a problem with the sensor that monitors the temperature of the exhaust gases, and it has likely shut down as a safety precaution.
110 High Your boiler has become too hot and has shut itself down as a safety precaution to prevent damage.
119 High Your boiler has stopped working because the water pressure in the central heating system has dropped too low.
125 High Your boiler is struggling to move water around the system correctly, which is causing it to shut down to prevent overheating.
130 High Your boiler has detected that it is getting too hot inside, often because something is blocking the flow of heat or a sensor is faulty.
133 High Your boiler has tried to light several times but cannot establish a stable flame, meaning it cannot provide heating or hot water.
160 High Your boiler has detected that the fan, which safely removes waste gases, is not spinning at the correct speed to operate safely.
193 High Your boiler is struggling to move water around the system correctly, which is likely caused by trapped air or a failing pump.
E20 High Your boiler's temperature sensor for the heating system has stopped communicating correctly, meaning your boiler doesn't know how hot the water is and will likely stop running for safety.
E28 High Your boiler's internal computer brain is either faulty or has been replaced with the wrong software version for your specific model.
E50 Medium Your boiler's hot water sensor has malfunctioned, meaning the system can no longer accurately measure the temperature of the water coming out of your taps.
E110 High Your boiler has likely overheated, causing a safety switch to trip and shut the system down to protect itself.
E119 High Your boiler has detected that the water pressure is too low for it to operate safely and has shut down.
E125 High Your boiler is struggling to move water through the system, which is causing it to stop running to prevent overheating.
E130 High Your boiler has shut down because a sensor has detected that the exhaust gases are getting too hot, which is a safety measure to prevent damage.
E133 High Your boiler has failed to light because it isn't receiving enough gas or cannot sense the flame.
E160 High Your boiler has detected an issue with the fan that clears exhaust fumes, preventing the system from starting for your safety.
E193 High Your boiler has detected that the water is not moving through the system quickly enough before the burner fires up.

Potterton Promax Combi HE Plus 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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