BoilerFaultCodesGrant Outdoor Combi 90 Mkii Fault codes & diagnostics
The manual for this boiler has no fault code table.
Combi Oil 26 kW 2004-2009 Discontinued
Replaced by: Vortex Outdoor Combi
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No fault code table in its manual
We've read the Grant Outdoor Combi 90 Mkii manual we hold, and it has no fault code table, so there are no codes to list. We don't fill the gap with codes from a similar boiler, because the same code can mean something different on another model. The fault code table in the installation manual is the one to trust.