Ariston boiler fault codes help identify where a problem has occurred, such as the heating circuit, ignition system, temperature sensors, fan, PCB or condensate drainage system. Common codes include 101 for overheating, 108 for insufficient water pressure, 501 for no flame detection and 612 for a fan-speed problem. Older Ariston boilers may use a different…
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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…
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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…
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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…
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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,…
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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,…
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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…
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