Source-backed catalogue
Verified boiler fault-code guides
Choose a supported model and code to read the catalogue entry and its source documents.
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
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