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Potterton fault codes — in plain English.
Enter the code shown on your boiler display to find published, verified guidance for the matching model range. If a code appears in more than one range, choose yours to open the right record.
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Enter the code as it appears on your Potterton boiler display. We show published, verified entries for the matching range.
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Verified boiler fault-code guides
Choose a supported model and code to read the catalogue entry and its source documents.
Potterton · Promax Combi HE Plus
- Potterton E119Water pressure switch not operated; primary pressure below 0.5 bar.
- Potterton E20Central heating temperature sensor (NTC) fault.
- Potterton E50Hot water temperature sensor (NTC) fault.
- Potterton E110Safety thermostat operated (overheat).
- Potterton E125Circulation fault (primary circuit).
- Potterton E28E28 means the boiler has detected a fault with its flue temperature sensor. This sensor monitors the flue temperature, and the manual classifies the code as a component fault.
- Potterton E133E133 means the boiler could not establish or detect a flame. The manual lists an interrupted gas supply, failed ignition or a flame that was not detected as possible causes.
- Potterton E160E160 means the boiler has detected a fault with its fan or fan wiring. The fan is part of the system that moves combustion gases through the flue.
Potterton · Gold Combi HE
- Potterton E119Water pressure switch not operated — primary pressure below 0.5 bar.
- Potterton E20Central heating NTC fault.
- Potterton E50Hot water NTC fault.
- Potterton E125Circulation fault (primary circuit).
- Potterton E110Safety thermostat operated (overheat of primary water or flue system).
- Potterton E160Fan or fan wiring fault.
Potterton · Assure Combi
- Potterton E09Gas valve connection fault
- Potterton E10Outdoor (external) sensor fault
- Potterton E12Water flow switch fault (stuck open)
- Potterton E13Water flow switch fault (stuck closed)
- Potterton E15Gas valve command fault
- Potterton E20Central heating temperature sensor fault
- Potterton E40Central heating return temperature sensor fault
- Potterton E83No communication (internal)
- Potterton E84No communication (internal)
- Potterton E85No communication (internal)
- Potterton E86No communication (internal)
- Potterton E87No communication (internal)
- Potterton E109Pre-circulation fault
- Potterton E110Boiler overheat / safety thermostat operated
- Potterton E118System water pressure too low (below 0.5 bar)
- Potterton E125Water circulation fault (primary)
- Potterton E133Interruption of gas supply or ignition failure
- Potterton E154Flow/return temperature sensor test
- Potterton E270Dry fire (circulation fault)
- Potterton E317Wrong mains electrical frequency
- Potterton E321Hot water temperature sensor fault
- Potterton E385Under voltage (mains supply)
- Potterton E430Water pressure temporary fault