Boiler Fault Codes by Code

Not sure of your brand, or found the same code on two different boilers? These pages cover every fault code shared by two or more manufacturers — 351 codes in all — and explain what each means brand by brand. If you know your brand, browse by brand instead.

0–9

14 brands 012 brands 1P13 brands 1P23 brands 1P33 brands 1P43 brands 24 brands 33 brands 42 brands 4C2 brands 53 brands 5P12 brands 5P22 brands 5P32 brands 5P42 brands 63 brands 6P12 brands 6P22 brands 73 brands 82 brands 92 brands 9A2 brands 9U 2332 brands 103 brands 112 brands 122 brands 132 brands 203 brands 212 brands 303 brands 403 brands 432 brands 443 brands 452 brands 503 brands 582 brands 992 brands 1013 brands 1023 brands 1032 brands 1043 brands 1053 brands 1062 brands 1072 brands 1083 brands 1093 brands 1103 brands 1113 brands 1123 brands 1143 brands 1162 brands 1183 brands 2013 brands 2022 brands 2033 brands 2042 brands 2052 brands 2072 brands 2082 brands 2092 brands 3012 brands 3022 brands 3033 brands 3043 brands 4112 brands 4122 brands 4142 brands 5013 brands 5022 brands 5042 brands 6012 brands 6042 brands 6072 brands 6082 brands 6102 brands 6123 brands 7012 brands 7022 brands 7032 brands 7042 brands 7052 brands 7062 brands 7112 brands 7122 brands 7132 brands 7222 brands 7232 brands

A

B

b12 brands b72 brands

C

C02 brands C13 brands C24 brands C32 brands C43 brands C52 brands C62 brands C72 brands

D

D42 brands

E

F

F.004 brands F03 brands F16 brands F.014 brands F25 brands F.023 brands F35 brands F.033 brands F.043 brands F44 brands F.053 brands F56 brands F64 brands F.062 brands F073 brands F74 brands F082 brands F83 brands F092 brands F95 brands F106 brands F116 brands F125 brands F136 brands F144 brands F154 brands F162 brands F.173 brands F182 brands F192 brands F206 brands F.213 brands F225 brands F235 brands F.245 brands F.253 brands F.265 brands F.275 brands F285 brands F295 brands F.325 brands F.334 brands F.353 brands F374 brands F392 brands F402 brands F412 brands F.424 brands F434 brands F472 brands F.495 brands F512 brands F525 brands F535 brands F.543 brands F564 brands F.573 brands F.602 brands F616 brands F.625 brands F.635 brands F.645 brands F.655 brands F662 brands F676 brands F685 brands F.705 brands F.715 brands F.725 brands F736 brands F746 brands F.753 brands F765 brands F775 brands F782 brands F792 brands F.813 brands F835 brands F845 brands F855 brands F864 brands F872 brands F882 brands F892 brands F.903 brands F.913 brands F922 brands FA2 brands FD3 brands FU2 brands

H

H.01-.002 brands H.01-.052 brands H.01-.082 brands H.01-.142 brands H.02-.032 brands H.02-.042 brands H.03-.002 brands H.03-.012 brands H.03-.022 brands

L

L13 brands L23 brands L32 brands L42 brands L53 brands L62 brands