The Ariston A77 fault code means the boiler has detected a problem involving the condensate trap or its sensor circuit. It is mainly associated with Ariston Microgenus HE boilers rather than every Ariston model. Official Microgenus HE documentation lists three direct reasons for A77: a condensate trap full of water, a short-circuited condensate sensor or…
Read More
The Ariston A01 fault code means the boiler has failed to establish or confirm a burner flame within the permitted ignition time. The boiler then shuts off the gas supply and enters a safety lockout. A01 is commonly associated with older Ariston Microgenus, Microgenus II and Microgenus HE boilers. Possible causes include an interrupted gas…
Read More
The Ariston 612 fault code means the boiler has detected a fan-speed error. The fan may be rotating faster or slower than the speed requested by the boiler, or the PCB may not be receiving a reliable speed signal. The boiler may lock out because it cannot confirm that the fan and combustion system are…
Read More
The Ariston 101 fault code means the boiler has detected an overheat condition and stopped operating to protect the appliance. You may lose heating, hot water or both while the boiler remains locked out. Overheating commonly occurs when water cannot circulate through the boiler quickly enough. Possible causes include a faulty circulation pump, trapped air,…
Read More
Ariston SP1, SP2 and SP3 fault codes indicate that the boiler has experienced a problem while trying to ignite or maintain a flame. These codes are officially written as 5P1, 5P2 and 5P3. However, the number 5 can look like the letter S on some boiler displays, which is why homeowners often search for SP1,…
Read More
Baxi boiler problems often start small, then grow into bigger faults when you ignore early signs. You can handle some checks at home, like pressure and control settings. You must call a Gas Safe engineer for anything inside the boiler case. This guide covers the faults that owners report most often, plus the safest next…
Read More
The Ariston 501 error code means the boiler has attempted to ignite but has not detected a flame. As a result, the boiler enters a safety lockout and may stop providing heating and hot water. The problem may be caused by a temporary interruption to the gas supply. However, repeated 501 faults can also indicate…
Read More
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…
Read More
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…
Read More
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,…
Read More
