Air conditioning warranties & servicing requirements
Almost every air conditioning warranty in the UK is conditional: skip the annual documented service and a compressor failure in year four becomes your bill, not the manufacturer's. The usual conditions, extended warranties, who may service and what voids cover.
Why annual servicing is a warranty condition
Manufacturers guarantee the equipment, not the way it is looked after. The failures that cost real money — a compressor, an inverter board, a fan motor — are usually the end result of something a routine service would have caught: a slow leak running the compressor hot, a choked coil, a corroded terminal, a blocked drain. So cover is conditional on annual servicing by a qualified engineer, with evidence — the same logic as a car warranty and service history.
The £75–£150 per unit a yearly visit costs (see the servicing cost guide) buys an efficient system and a dated record that keeps the manufacturer on the hook for the expensive parts. See what a service includes and how often to service.
Standard, extended and workmanship warranties
Three warranties usually apply to a domestic installation; be clear which one you are relying on when something goes wrong.
| Warranty | Who gives it | Typical term | Usual conditions |
|---|---|---|---|
| Standard manufacturer warranty | Equipment manufacturer | Commonly 1–5 years | Certified installation; registered; serviced annually with records |
| Extended accredited-installer warranty | Manufacturer, via its installer scheme | Around 5–7 years (e.g. Daikin, Mitsubishi Electric) | Brand-accredited installer; registered in time; annual servicing, sometimes by an accredited engineer |
| Installer workmanship warranty | The installing company | Typically 1–2 years | Covers the installation work, not the equipment |
General terms across UK manufacturers and installer schemes, 2026; your installation documents are the authority. Air Con Surrey is a matching service and does not provide warranties.
The extended terms are the most tightly conditioned, so the records below matter most for those systems; our F-Gas certification guide covers the minimum qualification for anyone touching the system.
What to keep — the warranty file
A refused claim almost always comes down to a gap in the records rather than a genuine breach. Keep the following together for the full term:
- Installation certificate and commissioning sheet — model, serial number, date, installer's F-Gas number, charge and readings.
- Warranty registration confirmation — many schemes require registration within a set period.
- Your invoice — date of purchase and who installed it.
- A dated service report for every year — engineer, F-Gas details, serial number, checks done, readings, faults found and fixed. A detailed report is harder to argue with than "serviced".
- Repair invoices — so there is no unexplained gap.
If you move, hand the file to the buyer; if you inherit a system, ask for it.
Who is allowed to service a system under warranty
Anyone who opens the refrigerant circuit must hold an F-Gas qualification, and companies must be on a register such as REFCOM — that is the law, warranty or not. Most standard warranties ask for no more: a suitably qualified, F-Gas certified engineer, not necessarily the original installer.
Extended accredited-installer schemes can be stricter: some require the annual service to be done by an installer accredited for that brand. If you have a Daikin or Mitsubishi Electric system under an extended warranty and want to use a different engineer, check the scheme terms first. All the engineers we match you with are vetted and F-Gas certified, and a maintenance contract is the simplest way to make sure the annual visit happens and is recorded.
What voids an air conditioning warranty
Wording varies by brand, but these exclusions appear in almost every set of terms:
- Missed or undocumented servicing. A year without a recorded service usually breaks the chain.
- Work by unqualified people. Servicing, repairs or re-gassing without F-Gas certification — or, for some extended schemes, without brand accreditation.
- Unregistered installation. Missing the registration deadline, or a non-certified installer.
- Interference and modification. DIY attempts on the refrigerant circuit, relocating units, non-approved parts.
- Neglect and external damage. A choked coil that overheated, flooding, power surges, building work or pests.
- Use outside design limits. A domestic unit run as a 24/7 server-room cooler, for example.
- Consumables and cosmetics. Filters, batteries, remotes and casing marks.
If a claim is refused, your service file is your evidence. Out-of-warranty repairs are priced as normal work — see our repairs page and re-gas guide. For commercial operators, maintenance records also evidence F-Gas compliance.
Frequently asked questions
Keep your warranty valid
Tell us about your system and we match you with vetted, F-Gas certified engineers who service to manufacturer requirements and provide a written report. Free, no obligation.