Grant HVAC Repair Cost (UK, 2026)
Estimates reviewed July 2026 · appliance-repair figures maintained by a licensed appliance technician.
Grant HVAC repairs typically run £30–£3,230, depending on the HVAC system, the problem, and your local labour costs. Grant is a mainstream brand — its parts are cheaper and widely stocked, keeping the parts side of a repair below the class average. Every figure is an Estimated range in pounds, never a fake precise number. Reviewed July 2026.
Grant repair cost by HVAC Estimated
These ranges apply Grant's parts tier (0.85× the mainstream baseline) to the parts portion only — labour is unchanged and localizes to your area. Tap an HVAC system for its full problem-by-problem breakdown and the localizer.
| HVAC | Estimated Grant range |
|---|---|
| Grant heat pump repair | £45–£3,230 |
| Grant boiler repair | £30–£690 |
Base: 3 published national repair-cost guides (retrieved 2026-07) · full source registry on the methodology page · UK national base range (ONS ASHE 2025 SOC 5315) · Reviewed July 2026 · Estimated
What changes a Grant repair bill
- Brand tier — leading UK oil-boiler brand for off-gas-grid homes; oil units use a simple pressure-jet burner and a basic control board rather than a full modulating gas PCB. The factor comes from Grant's own observed basket: its temperature control PCB with sensor lists at £124.80 incl VAT — 0.52x the £240.00 midpoint of the £218.40-£261.60 mainstream gas PCB reference — with burner consumables commodity-priced (turbulator baffles £13.19-£14.87, condensate trap £42.00). That raw board ratio falls below the 0.80 floor this guide uses, so the factor is clamped up to 0.85 rather than set at the observed ratio. Firebird — whose observed boards (£110.00 non-combi, £182.47 combi) bracket Grant's and whose consumables are comparable — corroborates that floor level as a cross-check, not as the reason for it
- Parts vs labour — the brand and tier shift the parts price; labour tracks your area's wage index, not the brand.
- The specific fault — a sensor, seal, or valve is far cheaper than a compressor, motor, or control board.
- DIY vs professional — Some Grant faults (filters, seals, hoses) are DIY-feasible for confident owners; sealed-system and control-board work is a professional job.
Grant error & fault codes
When a Grant HVAC system shows a fault code, the diagnosis — and the price — gets specific. The most looked-up Grant codes:
Grant DHW PUMP indicator fast flash Grant DHW PUMP indicator slow flash Grant BURNER indicator slow flash Grant Grundfos pump LED: red / pos.5 yellow Grant Grundfos pump LED: red / pos.3 yellow Grant Wilo pump Run/Fault LED red steady Grant CH PUMP indicator fast flash Grant CH PUMP indicator slow flash Grant Grundfos pump LED: red / pos.4 yellow Grant Wilo pump Run/Fault LED flashing red Grant Wilo pump Run/Fault LED flashing red/green
Common Grant problems
Grant oil boilers present with the classic oil-fired service list: burner lockout on the control box, nozzle and oil-filter fouling causing failure to fire, dirty or misaligned photocell and electrodes, and sooting from poor combustion setup. Pressure loss and expansion-vessel faults appear on sealed systems as with any boiler. Its air-source heat pumps present the usual hydronic heat pump issues — flow rate, sensor and defrost-related faults.
Is Grant expensive to repair?
Grant is a major Irish/UK manufacturer (Grant Engineering, founded 1978) of condensing oil boilers, and also supplies air-source heat pumps, cylinders and controls. In oil-heated regions its equipment is very familiar to local technicians, which shortens diagnosis. Annual burner servicing is the dominant factor in its repair profile, since most call-outs trace to combustion setup and consumables. Burner components on Grant boilers are largely industry-standard oil-burner parts, which keeps consumables such as nozzles, filters and electrodes cheap and readily obtainable. Brand-specific parts come through Grant's Irish/UK distribution and merchant network with good regional coverage. Heat pump electronics are genuine-channel items.
Estimated labour-cost-localized ranges — see the methodology for the localization method and named sources.
Reviewed by a Red Seal–certified appliance technician who also holds a Technical Safety BC gas ticket (Gas-C) and an ODS/halocarbon refrigerant ticket (CFC/HCFC/HFC).