Before arguing about a manufacturer's commercial warranty, know the statutory rights it sits on top of and cannot cut down. Under the Consumer Rights Act 2015, goods must be of satisfactory quality, fit for purpose and as described; the client has a short-term right to reject within 30 days of delivery, and a fault appearing within the first 6 months is presumed to have been present at delivery unless the trader proves otherwise. Behind that, the Limitation Act 1980 gives 6 years in England and Wales to bring a claim founded on simple contract, 5 years from discoverability in Scotland. A "2 years parts, 5 years compressor" schedule is a commercial promise added to all of this, and telling the client so before they read the booklet is what keeps a service call from becoming a dispute.
Understanding a heat pump manufacturer warranty in 2026: what it actually covers
Legal vs. commercial warranty: who's responsible between the seller, installer, and manufacturer
In 2026, keep three levels in mind. The legal warranty of conformity is the seller's responsibility, often the company that supplies the heat pump. Alongside it, the warranty against hidden defects also protects the client. The installer remains responsible for their installation and settings, covered by the warranties tied to the work itself and their insurance. The manufacturer, for its part, offers a commercial warranty on the machine. It's useful, but bound by conditions.
Parts, labor, travel: the level of coverage varies by brand
Most manufacturer warranties primarily cover parts alone. Labor and travel are sometimes included for a shorter period, or only through an approved network. Watch out for common exclusions. Refrigerant, filters, consumables, lack of maintenance, or non-compliant commissioning can void coverage.
Typical durations and warranty extensions: what to check before proposing
The market standard, imposed by no statute: 2 years as a base, often 5 years on the compressor, with variations by product range. Extensions go further, but almost always require product registration, periodic maintenance, and proof of installation by a qualified professional. Before proposing one, check the caps, the reporting deadlines, and who handles after-sales service.
Common coverage: the faults typically covered
Compressor, circuit board, fan: the components usually covered (and under what conditions)
In most manufacturer warranty contracts, "internal" faults on the compressor, circuit board, fan, or sensors are generally covered, for parts and sometimes labor. The conditions come up often. Compliant commissioning, maintenance carried out, and supporting evidence. Fouling, a power supply fault, a leak caused by poor installation, or normal wear quickly fall outside the scope.
Air-to-water, air-to-air, geothermal: warranty variations by technology
An air-to-air heat pump has fewer hydraulic components, but remains sensitive to boards and motors. For air-to-water, coverage may also extend to the circulator, 3-way valve, and hydraulic safety device, depending on the options. For geothermal, the ground loop and its accessories may be handled separately. This is a point worth confirming at the quoting stage to avoid a grey area on the day of a breakdown.
Part replacement vs. standard exchange: what changes for your job
Replacing a part limits downtime, but requires a precise diagnosis, part availability, and rework on refrigerant sealing. A standard exchange is faster, but involves removal, evacuation, and a full recommissioning. On the scheduling side, plan for a technical window and clear traceability. This secures the coverage and avoids repeat visits.
Common exclusions: the usual reasons for a manufacturer warranty refusal
Lack of maintenance, non-compliant settings, missing proof: the most common refusals
A manufacturer often refuses warranty coverage when the maintenance specified in the manual wasn't carried out, or when the base settings were changed without a record. Without a maintenance invoice, service report, or dated photos, the case stays weak. Also keep the proof of purchase and the commissioning date.
Poor commissioning and incorrectly recorded parameters: the manufacturer's checkpoints
Commissioning isn't a formality. The manufacturer generally checks the start-up report, the serial number, the parameters (heating curve, temperatures, flow rates), and the safety devices. If a key parameter is inconsistent or missing, the fault can be classified as non-compliant. For guidance on best practices, see also commissioning of a heat pump and the checks not to skip.
Water quality, sludge, corrosion, fouling: when the installation is called into question
On a hydraulic circuit, sludge and corrosion are classic reasons for refusal. The manufacturer may request a water analysis, and check for a sludge trap, filter, flushing, and appropriate treatment. If the heat exchanger is fouled or corroded by aggressive water, responsibility often shifts to the installation rather than the appliance.
Conditions to meet to secure the warranty on your installations
Commissioning, certification, product registration: steps not to skip
For the manufacturer warranty to hold, commissioning must follow the manual, usually carried out by a qualified professional. Request the commissioning certificate, note the serial number, and register the product within the required timeframe. Keep the invoice and the handover report.
Maintenance log, visits, readings: organizing your evidence without extra burden
A simple maintenance log is enough. Keep the visit reports, the settings, and a few dated photos of connections and parameters. For certain equipment (heat pumps, air conditioning), periodic maintenance is required. Centralize everything in PDF form, in a shared client file. When the job is run from the client record, photos, progress and snag clearance stay attached to the file.
Original parts and service work: what the manufacturer expects during after-sales support
For after-sales support, the manufacturer expects traceability. Use original parts or validated equivalents. Avoid unplanned modifications. Use an approved repair technician, and request a detailed service report. Without these elements, the warranty can be disputed.
Field advice: avoiding disputes and setting clear warranty terms with the client
Clauses to include in the quote and handover report: clarifying what's guaranteed
In the quote, describe the scope down to the last detail. Equipment references, surface areas, thicknesses, accessories, and what falls outside the job. Note the access conditions, the limits regarding existing structures, and the exclusions. State that the signed handover triggers the warranty. On the handover report, date it, list any reservations, and mention the commissioning and the handover of the manuals.
Clearly distinguishing manufacturer warranty, installation warranty, and legal warranties: explain it without jargon
Explain it in one sentence. The manufacturer warranty covers the product. Your installation warranty covers your work. The statutory rights protect the client even if the manufacturer doesn't follow through. The table below is the one to put on the back of the handover sheet, because it closes the argument better than a sales pitch.
| Right | Duration | Starting point | Source |
|---|---|---|---|
| Short-term right to reject faulty goods | 30 days | Delivery | Consumer Rights Act 2015, s.22 |
| Presumption that the fault was present at delivery | 6 months | Delivery | Consumer Rights Act 2015, s.19(14) |
| Right to repair or replacement, then price reduction or final right to reject | No fixed cut-off, subject to limitation | Delivery | Consumer Rights Act 2015, ss.23 and 24 |
| Limitation period for a claim founded on simple contract | 6 years in England and Wales | Breach of contract | Limitation Act 1980, s.5 |
These cannot be excluded by contract. A manufacturer's commercial warranty is contractual: its duration, scope and exclusions are read in its own conditions, not in statute.
After-sales procedure: preparing the file (photos, fault codes, readings) to save time
To avoid back-and-forth, put together an after-sales file as soon as the call comes in. To frame your obligations and limit risk, also lean on our article on tradesperson liability in energy renovation.
- Dated photos, rating plate, serial number.
- Fault codes, regulation screenshots, readings (temperatures, pressures, flow rate).
- Commissioning report, maintenance record, and handover report.
