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Potterton — Promax Combi / System
Select a fault code
Fault Codes
E1Low water pressure🔄 Try Reset
Pressure below minimum.
E10Gas valve fault🔧 Engineer Required
Gas valve fault detected.
E2Flame loss🔄 Try Reset
Flame extinguished during operation.
E3Fan fault🔧 Engineer Required
Fan speed outside required range.
E4Ignition lockout🔄 Try Reset
Boiler failed to ignite.
E5Return NTC fault🔧 Engineer Required
Return temperature sensor fault.
E6Flow NTC fault🔧 Engineer Required
Flow temperature sensor fault.
E9Overheat lockout🔧 Engineer Required
Boiler overheated — safety thermostat tripped.
📞 Potterton Direct Support
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