Oil Furnace Cad Cell / Primary Control Replacement — Repair Cost in France (2026)
France national estimate: €100–€620 for a oil furnace — cad cell / primary control replacement — built from French sources, never converted from another country's prices. Pick your quality tier and enter a postal code to localize. Reviewed July 2026.
Also searched as: “oil furnace primary control replacement cost”, “oil furnace cad cell relay repair cost”, “oil burner primary control lockout fix price”.
€100–€620 France national estimate for a oil furnace — cad cell / primary control replacement. Localize below.
| Most common repair | Typical total (EUR) | DIY? |
|---|---|---|
| Replacing the burner's photoresistive flame-detection cell | €100–€220 | Pro recommended |
| Replacing the oil burner's control box, the unit that manages ignition and lockout | €200–€620 | 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, or a specific French brand to override it (both adjust the parts portion only, never labour). Enter a French postal code to localize to your region's labour costs. All figures stay in euros, never converted from another country's prices. Everything updates without a page reload.
Base: published rates from 4 French heating & cooling companies (2026-07) · France national base range (Insee Tous salariés 2023) · Reviewed July 2026 · Estimated
How do brand and quality tier change the repair cost?
Brand and tier adjust the parts portion only — never labour. Value-tier brands — Ariston, Chaffoteaux and Auer — carry some of the lowest parts factors; Saunier Duval, ELM Leblanc, De Dietrich, Chappée, Atlantic, Thermor and Riello form the mainstream core of the French heating market, with Saunier Duval as the price anchor for this list; premium makers — Vaillant, Frisquet and Viessmann — source mainly through the manufacturer's own network (pièces d'origine). On the heat-pump and split-system side, Daikin, Mitsubishi Electric and Toshiba sit in the premium tier, Panasonic, LG and Atlantic in the mainstream core, and Airwell at the value end. Pick a tier for a class-typical estimate, or a specific French brand to override it.
| Brand | Parts factor | Basis |
|---|---|---|
| Basic tier parts ×0.925 | ||
| Chaffoteaux | ×1 | Baseline — no parts adjustment |
| Ariston | ×1 | Baseline — no parts adjustment |
| Auer | ×0.85 | Parts ×0.85 (published rates from 2 local repair companies) |
| Airwell | ×0.85 | Parts ×0.85 (published rates from 3 local repair companies) |
| Mid-range tier parts ×1.1 | ||
| Saunier Duval | ×1 | Baseline — no parts adjustment |
| ELM Leblanc (Bosch) | ×1.5 | Parts ×1.5 (published rates from 2 local repair companies) |
| De Dietrich | ×1.3 | Parts ×1.3 (published rates from 5 local repair companies) |
| Chappée | ×1.5 | Parts ×1.5 (published rates from 3 local repair companies) |
| Atlantic | ×0.9 | Parts ×0.9 (published rates from 3 local repair companies) |
| Thermor | ×1.15 | Parts ×1.15 (published rates from 2 local repair companies) |
| Riello | ×0.9 | Parts ×0.9 (published rates from 2 local repair companies) |
| Cuenod | ×1.1 | Parts ×1.1 (published rates from 2 local repair companies) |
| Panasonic | ×0.85 | Parts ×0.85 (published rates from 3 local repair companies) |
| Premium tier parts ×1.15 | ||
| Frisquet | ×1.05 | Parts ×1.05 (published rates from 2 local repair companies) |
| Vaillant | ×1.15 | Parts ×1.15 (published rates from 3 local repair companies) |
| Viessmann | ×1.1 | Parts ×1.1 (published rates from 2 local repair companies) |
| Daikin | ×1.35 | Parts ×1.35 (published rates from 2 local repair companies) |
| Mitsubishi Electric | ×1.6 | Parts ×1.6 (published rates from 2 local repair companies) |
Base: French brand parts factors from French parts retailers and repair guides; tier factor = median of the tier's French brands · Applied to the parts portion only · Reviewed July 2026 · Estimated
Oil Furnace cad cell / primary control replacement: what usually causes it? Estimated
-
Replacing the burner's photoresistive flame-detection cell
Pro recommended€100–€220
A fouled or badly refitted cell is one of the most frequently cited causes of an oil boiler going into lockout: the burner lights, the flame is not seen and the control box locks out within seconds. The part costs little, French distributors showing the common photoresistive cells at €17.43 to €26.70 including VAT; only the ultraviolet detection cells, rarer in the domestic stock, rise to close to €259 including VAT and fall outside this range. Most of the bill is therefore the call-out charge and the hour of labour, as the national repair fixed prices recorded at €99 and €109 including VAT and the €80 to €150 quoted by the independent repairers confirm. The final check goes through a verification of the flame and the combustion, therefore through a heating engineer.
-
Replacing the oil burner's control box, the unit that manages ignition and lockout
Pro recommended€200–€620
When the burner no longer launches any sequence at all, neither pre-purge nor spark, it is the control box that is suspected; the control unit appears explicitly among the parts that professionals add to the quote when they find wear. French distributors show the domestic control boxes from €140.00 including VAT for a TF 830.3 to €271.70 including VAT for a TF 844, by way of €193.60 including VAT for a G22 S09; the high-output references, beyond a thousand euros, do not concern domestic boilers. The labour follows the oil heating engineer's hourly rate recorded, €40 to €80 an hour and up to €150 an hour for a specialist, plus €20 to €40 of call-out charge. The control box directly drives the combustion safety chain: neither the choice of reference nor the wiring is a DIY matter.
Base: published rates from 4 French heating & cooling companies (2026-07) · France national base range (Insee Tous salariés 2023) · Reviewed July 2026 · Estimated
How much is a service-call fee for oil furnace repair?
Most French companies charge a call-out / diagnostic fee of €80–€170, often credited toward the repair if you go ahead. It is separate from the repair totals above. VAT on French home heating and cooling work is usually the 10% reduced rate for repair and maintenance in a dwelling completed more than two years ago, not the 20% standard rate; some energy-performance improvement work can fall to 5.5%, depending on the equipment fitted and the rules in force. Many independent installers and micro-entrepreneurs also fall under France's small-business VAT exemption (franchise en base de TVA, €37,500 threshold for services) and charge no VAT at all — their invoices carry the note "TVA non applicable, art. 293 B du CGI". Prices displayed to consumers in France are quoted TTC (toutes taxes comprises — all taxes included).
Is it worth repairing a oil furnace, or should you replace it?
A common rule of thumb: if the repair cost exceeds roughly half the price of a comparable new unit — or the appliance is past ~8 years for a oil furnace — replacement is often the better value. The calculator's localized totals give you the number to weigh against a new-unit quote.
Prices are region-level estimates based on regional wage data (Insee, Tous salariés 2023 all-employees base), not fake city precision. Shopping in the U.S.? See the U.S. version (USD). In Canada? See the Canadian version (CAD). See the methodology for the localization method and named sources, or return to the France HVAC repair guide.
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).