Source-backed catalogue
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.
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