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.
6,439+ fault codes
29 boiler brands
702+ models covered
Popular boiler brands
All 29 brands → Ideal
1,016 codes · 89 models
Worcester Bosch
996 codes · 78 models
Vaillant
821 codes · 63 models
Glow-worm
733 codes · 67 models
Potterton
659 codes · 36 models
Vokera
541 codes · 37 models
Viessmann
379 codes · 31 models
Remeha
375 codes · 21 models
Baxi
208 codes · 68 models
Intergas
167 codes · 18 models
Ferroli
112 codes · 20 models
Alpha
71 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.