| Fault Codes | Brand |
|---|---|
| A | A |
| ACV | ACV |
| Alpha | Alpha |
| Ambirad | Ambirad |
| Amptec | Amptec |
| Andrews | Andrews |
| Ariston | Ariston |
| Atag | Atag |
| Atmos | Atmos |
| B | B |
| Baxi | Baxi |
| Baxi Commercial | Baxi Commercial |
| Biasi | Biasi |
| British Gas | British Gas |
| Broag | Broag |
| Buderus & Camray | Buderus & Camray |
| C | C |
| Chaffoteaux | Chaffoteaux |
| D | D |
| Daikin | Daikin |
| Dimplex | Dimplex |
| E | E |
| EHC | EHC |
| Esse | Esse |
| F | F |
| Ferroli | Ferroli |
| Firebird | Firebird |
| G | G |
| Geminox | Geminox |
| Gledhill | Gledhill |
| Glow-Worm | Glow-Worm |
| Grant | Grant |
| H | H |
| Halstead | Halstead |
| Hamworthy | Hamworthy |
| Heatline | Heatline |
| HRM | HRM |
| I | I |
| Icon | Icon |
| Ideal | Ideal |
| Intergas | Intergas |
| J | J |
| Johnson & Starley | Johnson & Starley |
| K | K |
| Keston | Keston |
| Kinder | Kinder |
| L | L |
| M | M |
| MHG | MHG |
| Main | Main |
| Malvern | Malvern |
| Maxol | Maxol |
| MHS | MHS |
| Myson | Myson |
| N | N |
| Navien | Navien |
| Nuway | Nuway |
| P | P |
| Potterton | Potterton |
| PROcombi | PROcombi |
| Protherm | Protherm |
| R | R |
| Ravenheat | Ravenheat |
| Remeha | Remeha |
| Reznor | Reznor |
| Robinson Willey | Robinson Willey |
| S | S |
| Sabre Boilers | Sabre Boilers |
| Saunier Duval | Saunier Duval |
| Sime | Sime |
| T | T |
| Trianco | Trianco |
| V | V |
| Vaillant | Vaillant |
| Viessmann | Viessmann |
| Vokera | Vokera |
| W | W |
| Warmflow | Warmflow |
| Warmhaus | Warmhaus |
| Wickes | Wickes |
| Worcester Bosch | Worcester Bosch |
| Z | Z |
| Zanussi | Zanussi |
| Fault Codes Last Updated: 16/08/20 |
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