Category: Alpha Fault Codes

Alpha boiler fault codes help identify why your boiler has stopped working, locked out or displayed an error message. Common Alpha error codes can relate to ignition failure, low system pressure, overheating, fan faults, flame detection problems, circulation issues or flue-related faults. The fault code is only a starting point. It does not always confirm…

The Alpha E96 fault code usually points to a flue, airflow or combustion-air problem on relevant Alpha boiler models. On Alpha InTec² 25X and 28X manuals, code 96 is listed as a blocked flue fault, and related checks include the flue/air circuits and fan function. This is not a fault homeowners should try to repair…

The Alpha E43 fault code usually means the boiler has detected a loss of flame rectification. In simple terms, the boiler may have lit, but it cannot reliably confirm or maintain the flame, so it locks out as a safety precaution. On Alpha fault-code references, code 43 is commonly listed as loss of flame rectification,…

The Alpha E37 fault code generally means that the boiler has detected an insufficient electrical supply voltage. On Alpha boiler ranges that use code 37, the fault description is “low supply voltage”, meaning the boiler does not have enough electrical supply to operate correctly. This is not usually a water-pressure, gas-supply or radiator-circulation fault. However,…

If you have searched for the Alpha E01 fault code, your Alpha E-Tec 28 or E-Tec 33 boiler may show the fault as 01 on its display. On these models, code 01 means an ignition failure: the boiler attempted to light but did not detect a flame during the ignition sequence. It can be linked…

If your Alpha boiler is displaying the E10 fault code, it normally means the central-heating system pressure is too low for the boiler to operate correctly. On Alpha E-Tec NX 28 and 33 models, E10 is described as primary system pressure low. On E-Tec Plus NX 28, 33 and 38 models, it is described as…

If your boiler has stopped working and is showing an Alpha E8 fault code, particularly E8, it means the system has reached the maximum number of reset attempts. This is a built-in safety feature designed to prevent damage or unsafe operation. The good news? In many cases, this issue can be diagnosed and sometimes resolved…

If your boiler has suddenly stopped working and is displaying the Alpha E20 fault code, it usually points to a flame sensing fault or ignition failure. This means the boiler cannot detect a flame during operation, so it shuts down as a safety precaution to prevent gas buildup. In this guide, we’ll break down the…