Warm Air Heating System Repair Cost (2026)
Most gas furnace repairs run £75–£7,500 depending on the problem, the brand tier, and your local labour costs — in pounds, from UK sources. Start from the problem, then localize. Reviewed July 2026.
£75–£7,500 across all common gas furnace repairs. Pick the problem to narrow it.
| Most common repair | Typical total (GBP) | DIY? |
|---|---|---|
| General no-heat diagnostic and minor repair (airflow, filter, ignition or gas-valve fault) | £100–£250 | Pro recommended |
| Escalation to gas-valve or control-board fault (root cause of persistent no-heat) | £300–£700 | Pro recommended |
Plus a typical service-call / diagnostic fee of £80–£170, often credited toward the repair.
Pick a quality tier for a class-typical estimate. Everything updates without a page reload; no data leaves your browser.
Base: 2 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
How much does gas furnace repair cost by problem? Estimated
| Problem | Typical range | Repairs priced |
|---|---|---|
| Not Heating / Blowing Cold Air | £100–£700 | 2 |
| Won't Turn On / No Power | £100–£500 | 2 |
| Short Cycling (Turns On and Off) | £100–£280 | 2 |
| Igniter (Hot Surface Ignitor) Replacement | £75–£220 | 2 |
| Flame Sensor Cleaning / Replacement | £75–£220 | 2 |
| Blower Motor Replacement | £150–£700 | 2 |
| Gas Valve Replacement | £180–£450 | 2 |
| Control Board Replacement | £80–£700 | 2 |
| Cracked Heat Exchanger Replacement | £1,200–£7,500 | 2 |
| Pilot Light / Thermocouple Won't Stay Lit | £100–£350 | 2 |
| Noisy or Loud (Banging, Rumbling, Squealing) | £100–£400 | 2 |
Base: 2 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
How do brand & quality tier change the parts cost?
Brand and tier adjust the parts portion only — never labour. Value brands such as Beko, Hotpoint and Indesit have the cheapest, most widely stocked parts; premium and luxury lines (AEG, Neff, Miele) carry pricier, often OEM-restricted components. Pick a tier in the calculator for a class-typical estimate, or a specific UK brand to override it.
| Brand | Parts factor | Basis |
|---|---|---|
| Basic tier parts ×0.9 | ||
| Ferroli | ×0.85 | Parts ×0.85 (published rates from 2 local repair companies) |
| Ravenheat | ×1 | Baseline — no parts adjustment |
| Vokera | ×0.9 | Parts ×0.9 (entry-price Italian-built combi range: the volume-model main PCBs list at £153.60, £154.80, £176.40, £200.40, £205.20 and £208.80 incl VAT against the £218.40-£261.60 Glow-worm mainstream reference, and everyday wear items are cheap (thermistor £18.59, 3-way valve cartridge £60.00, safety valve £27.60, o-rings £1.55-£3.83). Legacy Sabre/Linea HE boards run higher (£319.20-£502.80) and are excluded from the comparison as out-of-production model families, so the discount is stated as applying to the volume models rather than to the whole catalogue) |
| Alpha | ×0.9 | Parts ×0.9 (published rates from 1 local repair company) |
| Main | ×0.9 | Parts ×0.9 (Baxi Heating's entry-level badge sharing the Baxi/Potterton parts platform; its listed PCBs run £186.00 (Combi 30 ECO), £226.80 (Combi 25 ECO) and £237.60 (System 28 Eco) incl VAT against the £218.40-£261.60 Glow-worm mainstream reference — at the bottom of, or just under, the baseline band) |
| Potterton | ×0.9 | Parts ×0.9 (long-running Baxi-group brand with a very large legacy installed base and parts shared with Baxi and Main. On the domestic combi/system boards that are like-for-like with the reference, listings run £130.80 (Performa 24ECO HE), £230.40 (Kingfisher) and £248.40 (Promax Combi 33HE) incl VAT against the £218.40-£261.60 Glow-worm mainstream reference; the higher boards on the same page (£312.00-£840.00) are legacy Suprima/Netaheat and 60-260kW commercial units and are excluded from the domestic comparison for that reason. Wear items are cheap (NTC sensor £10.55, pressure relief valve £15.11, 3-way valve cartridge £64.80)) |
| Mid-range tier parts ×1 | ||
| Ideal | ×1 | Baseline — no parts adjustment |
| Baxi | ×1 | Baseline — no parts adjustment |
| Glow-worm | ×1 | Baseline — no parts adjustment |
| Ariston | ×1.2 | Parts ×1.2 (published rates from 3 local repair companies) |
| Grant | ×0.85 | Parts ×0.85 (published rates from 2 local repair companies) |
| Firebird | ×0.85 | Parts ×0.85 (published rates from 2 local repair companies) |
| Warmflow | ×0.95 | Parts ×0.95 (Northern Ireland-built oil-boiler brand, common in NI and in off-grid mainland homes; same commodity oil architecture as Grant and Firebird (pressure-jet burner, no modulating gas PCB), but its listed parts sit at the top of the oil band — baffles £45.64-£57.97 against Grant's £13.19-£14.87, dual thermostat £75.60, flue stat £52.60, condensate assembly £57.60, flexible flue hose £38.58, all incl VAT — so it is set just under the mainstream baseline rather than level with the other two oil brands. No Warmflow control-board price is published, so unlike Grant and Firebird this factor rests on wear and flue items only, with no like-for-like board comparison) |
| Samsung | ×1.2 | Parts ×1.2 (published rates from 2 local repair companies) |
| LG | ×1.2 | Parts ×1.2 (published rates from 2 local repair companies) |
| Premium tier parts ×1.3 | ||
| Worcester Bosch | ×0.85 | Parts ×0.85 (published rates from 7 local repair companies) |
| Vaillant | ×1.2 | Parts ×1.2 (German premium boiler brand: its ecoTEC Plus/Pro main PCBs list at £253.20, £265.20 and £295.20 incl VAT against £218.40-£261.60 for its own Glow-worm sister brand's mainstream boards — a median of £265.20, or 1.10x the £240.00 baseline midpoint (mean 1.13x) — while London repair guides put proprietary Vaillant/Worcester spares 15-25% above universal parts. 1.2 sits between the two readings and is this guide's lower board-ratio reference point for the premium band. Display boards are cheaper (£88.80-£111.60) and one legacy board lists at £134.40; both classes are excluded from the ratio as not being main control boards) |
| Viessmann | ×1.25 | Parts ×1.25 (German premium brand with a comparatively small UK installed base and a stockist-controlled spares channel; the Vitodens control-console PCB lists at £364.80 incl VAT against the £240.00 baseline midpoint — 1.52x, this guide's upper board-ratio reference point — with the 100-W combi plate heat exchanger at £186.00 and a boiler sensor at £73.66, placing genuine parts clearly above the baseline across the basket rather than on the board alone) |
| Intergas | ×1.3 | Parts ×1.3 (published rates from 2 local repair companies) |
| ATAG | ×1.3 | Parts ×1.3 (Dutch premium boiler brand with a small UK installed base and importer-controlled genuine spares, but priced listings do exist: the MCBA control units list at £536.40 and £582.78 incl VAT and the OSS4 fan at £419.66, against £218.40-£261.60 for a mainstream PCB and £364.80 for the premium Viessmann board — i.e. above Viessmann on the like-for-like control-board comparison. Hydraulic parts are ordinary (3-way valve actuator £152.40, water pressure sensor £116.40, ignition electrode £80.40, service kit £64.80, safety valve £50.40)) |
| Daikin | ×1.3 | Parts ×1.3 (the largest air-to-water heat-pump and split-AC brand in the UK/European market; spares are genuine-OEM through importer and specialist channels with no aftermarket equivalents, and headline components dwarf boiler parts — compressor £717.25, condenser coil £2,073.48, crankcase heater £236.21, thermostat £90.87 against a £218.40-£261.60 mainstream boiler PCB) |
| Mitsubishi Electric | ×1.3 | Parts ×1.3 (Ecodan is the best-known air-source heat pump in the UK and Mr Slim the common split AC; genuine boards and motors are distributed through specialist AC parts suppliers, and the top of the range runs far above domestic boiler components — power PCB £714.73, control board £283.04, noise-filter PCB £224.19, fan motor £179.29, compressor £1,244.88. The 1.3 is carried by the power PCB and the compressor; the control board alone (£283.04) is only modestly above the mainstream boiler reference, so the headline figures should not be read as applying to every part) |
| Panasonic | ×1.3 | Parts ×1.3 (published rates from 2 local repair companies) |
| Toshiba | ×1.3 | Parts ×1.3 (published rates from 2 local repair companies) |
Gas Furnace error codes
When the display shows a fault code, the diagnosis — and the price — gets specific. 286 gas furnace codes are decoded in the error-code directory; the most looked-up:
Goodman 5 flashes Goodman 7 flashes Goodman 8 flashes Amana 5 flashes Amana 7 flashes Amana 8 flashes Trane 8 flashes American Standard 5 flashes American Standard 7 flashes American Standard 8 flashes American Standard 9 flashes Carrier 24
How much is a gas furnace service-call fee?
Most UK companies charge a diagnostic / service-call fee of £80–£170, often credited toward the repair if you proceed.
Base: published rates from 3 UK repair companies · National fee range · Reviewed July 2026 · Estimated
Is it worth repairing a gas furnace?
If the repair quote exceeds roughly half the price of a comparable new gas furnace — or the unit is well past its typical service life — replacement is often the better value. Localize the repair range above first, then compare.
Prices are region-level estimates based on labour-cost data, not fake city precision. 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).