Potterton Fault Codes
Comprehensive reference table of all Potterton boiler error codes. Click any code for detailed troubleshooting steps.
Pro Tip
Check your boiler's digital display panel (usually behind a drop-down cover) to find the current active fault code.
| Error Code | Description | Applies To |
|---|---|---|
| E118 / E119 | Primary system water pressure is too low (< 0.5 bar). | 600 / 800 / Assure |
| E133 | Gas supply fault / Ignition failure; check spark electrode and gas valve. | Duo-tec / Promax |
| E110 | Boiler maximum temperature exceeded / Safety thermostat tripped. | Platinum / Titanium |
| E125 | Water circulation fault; excessive temperature gradient detected. | 400 / 600 / 800 |
| E168 | PCB Lockout / Unidentified error; often related to power surges or corrupted memory. | Duo-tec / Promax |
| E160 | Fan fault; tachometer feedback error or fan wiring fault. | 600 / 800 Series |
| E09 | Gas valve connection fault; issue with the gas valve command cable. | Platinum / Assure |
| E20 | Central heating flow NTC sensor fault (short/open circuit). | 600 / 800 Series |
| E40 | Central heating return NTC sensor fault (short/open circuit). | 600 / 800 Series |
| E28 | Flue NTC sensor fault (short/open circuit) or blocked flue. | 600 / 800 Series |
| E50 | Domestic Hot Water (DHW) NTC sensor fault. | 600 / 800 Series |
| E128 | Safety error for frequent loss of flame (detected 12 times). | 600 / 800 Series |
| E130 | Flue thermostat sensor tripped, causing a safety lockout. | 600 / 800 Series |
| E134 | Elapsed time gas valve open without gas (short request in short period). | 600 / 800 Series |
| E135 | Internal error; interruption of gas supply internally. | 600 / 800 Series |
| E270 | Dry fire / Circulation fault detected. | 600 / 800 Series |
| E384 | False flame (parasitic flame) detected when gas valve is actively closed. | 600 / 800 Series |
| H.01.00 | Temporary loss of communication between gas valve and boiler board. | 600 / 800 Series |
| H.01.05 | Maximum temperature difference between flow and return exceeded. | 600 / 800 Series |
| H.01.08 | Flow temperature rising too quickly; temporary 10-minute stoppage. | 600 / 800 Series |
| H.01.18 | Temporary loss of water circulation detected. | 600 / 800 Series |
| H.02.06 | System water pressure in the heating circuit is temporarily too low. | 600 / 800 Series |
| E.02.17 | Permanent communication failure between gas valve and boiler PCB. | 600 / 800 Series |
| E.04.10 | Burner failed to ignite after four programmed attempts. | 600 / 800 Series |
| E.04.13 | Fan impeller blocked or fan speed has exceeded its maximum RPM. | 600 / 800 Series |
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