Alpha Fault Codes
Comprehensive reference table of all Alpha 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 |
|---|---|---|
1 / E01 / 0A1 | Ignition failure; check gas supply, pressure tubes, and flame sensor. | E-Tec NX / Evoke |
2 / 0A3 | Overheat lockout; blocked heat exchanger, pump failure, or tripped thermal fuse. | E-Tec NX / Evoke |
10 / E10 | Low primary system water pressure; requires manual re-pressurisation. | E-Tec NX / Evoke |
60 | Pump error; pump is physically stuck or experiencing an electrical fault. | E-Tec Plus / NX |
61 | Air in pump / restricted central heating flow; check valves and system purge. | E-Tec Plus / NX |
3 | High flue thermostat temperature; restricted primary flow or blocked exchanger. | E-Tec NX / Evoke |
4 | Gas valve electrical fault; wiring connections to the PCB. | E-Tec NX / Evoke |
0A5 | Fan speed fault; issue with flue/ventilation or fan wiring connections. | AlphaProTec Plus |
47 / E47 | Exhaust thermostat intervention; flue gas temperatures have exceeded limits. | E-Tec NX / Evoke |
70 | Return/flow sensor fault; possible wiring fault or incorrect resistance. | E-Tec NX / Evoke |
0A31 | Flow sensor out of range; sensor detecting temperature outside normal parameters. | AlphaProTec Plus |
5 | Heating flow sensor fault; wiring issue or sensor failure. | E-Tec NX / Evoke |
16 | Fan fault; fan wiring connections or PCB fault. | E-Tec NX / Evoke |
20 | Flame sensing fault; check flame sensing electrode and lead. | E-Tec NX / Evoke |
25 | Overheat lockout; caused by air in the heat exchanger or restricted flow. | E-Tec NX / Evoke |
0A9 | Gas valve electrical error; main PCB or valve connection issues. | AlphaProTec Plus |
0A43 | Return sensor short circuit; water ingress in connections or damaged wire. | AlphaProTec Plus |
0E33 | Low power supply voltage; electrical socket connection issues or power disruption. | AlphaProTec Plus |
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