BoilerFaultCodes
Grant Boiler Fault Codes
587 fault codes across 17 Grant boiler models — explained in plain English.
Irish manufacturer of oil and renewable heating systems. UK market leader for oil boilers.
Just want the most common Grant problems?
The top 8 faults across the whole Grant range — causes, DIY checks, repair costs.
High-severity Grant fault codes
Lock-out 10 12 Lock-out (Red neon) 15/26
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
Your boiler is struggling to vent exhaust gases properly when it starts up, which could lead to fumes building up in your home.
Vortex
Your boiler is allowing exhaust fumes to escape into your home, which is a serious safety concern that must be addressed immediately.
Vortex
Your boiler has stopped working because the flame inside failed to light or stay on.
Vortex
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
17 Grant boiler models
Vortex
Oil
Vortex Blue
OilSystem
Vortex Eco
OilSystem
Vortex Pro Combi
CombiOil
Vortex Pro 15-26
Oil
Vortex Pro
OilSystem
Vortex Pro Combi 26
CombiOil
Euroflame
RegularOil
Vortex 15-20
Regular Discontinued
Vortex 20-26
Regular Discontinued
Vortex Combi 70
CombiOil
Vortex Eco External Floor Standing
Regular Discontinued
Multi Pass
System Discontinued
Outdoor Combi 90 Mkii
Combi Discontinued
Spira
System Discontinued
Euroflame Condensing
OilRegular Discontinued
Vortex Eco External Wall Hung
System
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