Quick answer
A parts warranty is the manufacturer's promise to supply a replacement component; a labour warranty is the contractor's promise to install it without billing you for the time. Most major brands cover parts for 10 years when the equipment is registered inside their window, while labour is commonly covered for one year by the installer. A free part still costs you the visit.
A labour warranty and a parts warranty come from two different companies and cover two different halves of the same repair. The manufacturer that built your furnace stands behind the components inside it. The contractor who installed it stands behind the hours it takes to diagnose the fault and swap the piece. Homeowners get caught out when they have one and assume it includes the other.
Parts warranty: what the manufacturer covers
The parts warranty replaces a component that fails on its own — an igniter, a control board, a blower motor, an inducer. On most major residential brands the standard offer is 10 years on parts when you register the equipment within the manufacturer's window after installation, dropping to a shorter default term if nobody registers it. Heat exchangers usually carry a longer term of their own, sometimes for as long as you own the house. The exact terms vary by brand and model, so the certificate that came with your unit is the document that governs, not a salesperson's summary.
Labour warranty: what the installer covers
The labour warranty is the contractor's own commitment, and it is the one that varies most between quotes. One year is common on a standard install. Some companies sell extended labour coverage, and some include a longer term on higher equipment tiers. It typically covers the technician's time to diagnose and replace a warrantied part — and typically does not cover maintenance, filters, thermostat batteries, or damage from something outside the equipment such as a flooded basement.
What a covered repair still costs you
This is the practical difference. A blower motor replacement runs $500–$1,500 in parts and labour, and a control board $500–$1,200. When the part is covered but labour is not, you pay the labour share of that number plus the $90–$150 diagnostic to prove which part failed. On an eight-year-old furnace with parts coverage and no labour coverage, a Saturday no-heat call is still a real invoice. Ask what a covered repair costs out of pocket before you sign — that single question separates two otherwise identical quotes.
What shrinks or voids the coverage
- Installation by someone without a gas licence — manufacturers require professional installation, and in Ontario gas work is TSSA-licensed regardless
- Missing the registration deadline, which quietly cuts the parts term on most brands
- No record of annual maintenance, since many warranties require it and the claim asks for proof
- Restricted airflow — a filter left in for a year overheats a heat exchanger and gives a manufacturer a legitimate reason to decline
- Non-OEM replacement parts fitted by a previous contractor, or a unit moved to a different address
Is extended labour coverage worth buying?
Sometimes, and the deciding factor is what it costs against what it protects. Modern furnaces fail in their later years, not their early ones, so coverage that runs to year five is buying protection during the quietest stretch of the equipment's life.
Coverage that runs the full parts term is a different proposition, particularly on variable-speed and communicating equipment where an electronics failure means a long diagnostic. Ask three questions before you add it: how many years, what is excluded, and who honours it if the installing company changes hands. Coverage backed by the manufacturer travels; coverage backed by a small dealer does not always.
Two dates belong on your calendar
The first is the registration deadline, counted from the installation date on your invoice. The second is transfer: some manufacturers allow a one-time transfer to the next owner within a short window after the sale, sometimes for a fee, and some do not allow it at all — worth checking before you list, because a transferable warranty is a selling point in a Burlington or Oakville listing.
Keep the invoice, the permit and inspection paperwork from the City of Burlington or the City of Hamilton, the installer's licence number, and a photo of the serial-number plate together in one folder. Every claim asks for the install date and who did the work.
Common questions about HVAC warranties
- Does a warranty cover a Saturday call? The part, yes, if it is registered and within term. The visit is the labour side, and with ZK Mechanical a weekend visit costs the same as a weekday one because we charge no overtime or weekend surcharge.
- Will a missed tune-up void it? It can weaken a claim: many manufacturers ask for proof of annual maintenance when a heat exchanger or compressor fails. A tune-up at $120–$250 a year is cheap against that argument — what a furnace tune-up includes lists what should be on the report.
- Does a repair by another contractor void the manufacturer's warranty? Not on its own, provided the technician is licensed and fits OEM parts. A non-OEM board or an uncertified gas repair is what gives the manufacturer a reason to decline.
We register every unit we install, keep the commissioning paperwork on file, and put the labour term in writing on the quote rather than in conversation. If you want the maintenance record a warranty claim asks for, our maintenance plans document each visit — and our guide to HVAC warranty coverage explains what to read on your own certificate. Not sure what you have? Send us your model and serial number and we will tell you where you stand.