BoilerFaultCodes
UK Boiler Fault Code Database
What does your boiler
fault code mean?
Plain English answers for every major UK boiler brand. Free. No registration. No call-out required.
5,999+ fault codes
29 boiler brands
702+ models covered
Popular boiler brands
All 29 brands → Worcester Bosch
930 codes · 78 models
Ideal
901 codes · 89 models
Vaillant
791 codes · 63 models
Glow-worm
631 codes · 67 models
Potterton
612 codes · 36 models
Vokera
497 codes · 37 models
Remeha
369 codes · 21 models
Viessmann
291 codes · 31 models
Intergas
200 codes · 18 models
Baxi
192 codes · 68 models
Ferroli
110 codes · 20 models
Alpha
68 codes · 23 models
How it works
01
Find your brand
Select your boiler manufacturer from our list of UK brands.
02
Enter your code
Type the fault code shown on your boiler display.
03
Get plain English answers
Understand what it means, whether it's safe, and what to do next.
Gas safety reminder
Gas work must always be carried out by a Gas Safe registered engineer. This site provides guidance only — never attempt gas-related repairs yourself. Find a Gas Safe engineer →
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Wiring diagrams, fault history, and instant fix guides — all in your pocket on site. Built for Gas Safe registered engineers.