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Atag Boiler Error Codes . Fault code of f14, says the boiler’s central heating temperature on flow exceeds 95 degrees c, due to either a system fault, possible pump failure, or the thermistor needs to be. An ionization current was measured before the. The Most Common Fault Codes for Vaillant Boilers Explained Boiler heating system, Boiler from www.pinterest.com Error code fault fault description possible causes; These fault codes help a boiler. Greenstar 27/30 i system boilers.