| Error code | Possible fault |
|---|---|
| E09 | Gas valve wiring fault |
| E10 | Outdoor sensor error |
| E15 | Gas valave connection fault |
| E20 | Central heating thermistor sensor fault |
| E28 | Flue thermistor fault |
| E40 | Central heating return thermistor fault |
| E50 | Domestic hot water sensor fault |
| E53 | Flue obstruction |
| E55 | Calibration required |
| E78 | Water pressure sensor fault |
| E83/84/85/86/87 | No communication between room controller and boiler |
| E92 | Combustion test alarm during auto-setting |
| E109 | Poor circulation |
| E110 | Boiler overheat tripped |
| E117 | System pressure high (>2.9 bar) |
| E118 | System pressure low (<0.5> |
| E125 | Primary water circulation fault |
| E128 | Loss of flame during operation |
| E129 | Loss of flame during calibration |
| E130 | Flue thermostat sensor tripped (lockout) |
| E133 | Ignition fault |
| E135 | Internal error |
| E154 | Primary flow fault |
| E160 | Fan fault |
| E270 | Dry fire |
| E317 | Wrong power supply (HZ) |
| E321 | Hot water thermistor fault |
| E384 | Flame detected when gas valve off (false flame) |
| E385 | Low voltage (less than 195v) |
Potterton Gold Combi and System and Titanium Combi Boiler Error Codes
Gold Combi and System and Titanium Combi Boiler Error Codes