Grant Boiler Fault Codes

188 fault codes across 16 Grant boiler models — explained in plain English.

Irish manufacturer of oil and renewable heating systems. UK market leader for oil boilers.

188 fault codes
16 models documented
9 currently sold
7 legacy models

Grant fault codes on this site

We document 188 fault codes across 16 Grant models, covering 134 distinct codes. Grant boilers use light sequences and status descriptions rather than numbered codes. Codes for 16 of these models are taken directly from the manufacturer's own service or installation manual.

Models covered: Vortex, Vortex Blue, Vortex Eco, Vortex Pro 15-26, Vortex Pro, Vortex Pro Combi 26, Euroflame, Vortex 15-20, Vortex 20-26, Vortex Combi 70, Vortex Eco External Floor Standing, Multi Pass, Outdoor Combi 90 Mkii, Spira, Euroflame Condensing, Vortex Eco External Wall Hung.

Codes that appear on the most Grant models:
Lock-out 26.0 36.0 10 12 Burner lock-out
Just want the most common Grant problems?
The top 8 faults across the whole Grant range — causes, DIY checks, repair costs.
Most serious

High-severity Grant fault codes

Lock-out
Your boiler has stopped working to protect itself and needs to be restarted, though it may take a few attempts to get it running again.
Vortex
 10
Your boiler is struggling to vent exhaust gases properly when it starts up, which could lead to fumes building up in your home.
Vortex
 12
Your boiler is allowing exhaust fumes to escape into your home, which is a serious safety concern that must be addressed immediately.
Vortex
 Lock-out (Red neon)
Your boiler has stopped working because the flame inside failed to light or stay on.
Vortex
 15/26
Your boiler has detected a failure to ignite or a loss of flame during operation, meaning it cannot safely produce heat or hot water.
Vortex
All models

16 Grant boiler models

Vortex
33 fault codes · 2002-present
Vortex Blue
System
8 fault codes · 2016-present
Vortex Eco
System
53 fault codes · 2008-present
Vortex Pro 15-26
9 fault codes · 2008-present
Vortex Pro
System
4 fault codes · present
Vortex Pro Combi 26
Combi
7 fault codes · 2013-present
Euroflame
Regular
5 fault codes · 1994-present
Vortex 15-20
Regular Discontinued
12 fault codes
Vortex 20-26
Regular Discontinued
12 fault codes
Vortex Combi 70
Combi
5 fault codes
Vortex Eco External Floor Standing
Regular Discontinued
0 fault codes · 2008-2016
Multi Pass
System Discontinued
2 fault codes
Outdoor Combi 90 Mkii
Combi Discontinued
0 fault codes · 2004-2009
Spira
System Discontinued
25 fault codes
Euroflame Condensing
Regular Discontinued
6 fault codes · 2005-2015
Vortex Eco External Wall Hung
System
7 fault codes · 2008-2015
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