Planning annual furnace maintenance

Give the visit a clear purpose

Annual maintenance is an opportunity to assess the installed furnace and discuss changes since the previous visit. It should not be treated as a promise that no fault can occur later. Begin with the manufacturer's maintenance requirements and any recommendations in the last service record. TSSA encourages annual inspection of fuel-burning equipment.

Choose a time when the person who knows the household's concerns can speak with the technician. If the furnace is already failing to heat, explain that when arranging the visit. A maintenance appointment and a fault-diagnosis appointment may involve different work, fees and time requirements.

Know who is doing the work

For regulated fuel work in Ontario, verify the contractor's TSSA registration and the appropriate certification of the person doing the work. A business name on a vehicle or an advertisement is not the same as verification. Ask who will attend and whether any part of the work is subcontracted.

This website does not establish the qualifications of a provider merely by presenting an enquiry option. Before accepting service, confirm the provider identity, scope and commercial terms directly. Keep the company's contact details and invoice. That record is useful if follow-up is required or if you later sell the home.

Separate household care from technical service

Residents can manage the owner tasks described in their equipment instructions, such as checking the correct accessible filter and maintaining clear access. They can also record symptoms and arrange visits. Those tasks are different from inspecting combustion components, testing electrical systems, evaluating venting or adjusting equipment.

Do not open gas connections, bypass switches, dismantle a burner or attempt internal repairs to prepare for maintenance. Leave the system's technical condition available for professional assessment. If something appears damaged or unsafe, report it when booking and follow the relevant safety advice instead of trying to make the equipment look ready.

Prepare the equipment area

Provide a clear, safe route to the furnace and remove household storage from the access area without disturbing equipment or pipes. Maintain the clearances required by the installation. Tell the contractor about tight stairs, low basement ceilings, locked rooms or shared building access before the visit.

Keep pets secured and make sure an authorized adult can provide entry. In a managed low-rise Toronto property, coordinate service access with management where necessary; shared central systems and high-rises are excluded. In a rental, make sure the landlord or authorized decision-maker knows about the visit and can approve work if additional findings arise.

Bring observations rather than diagnoses

Write down unusual sounds, interruptions, uneven comfort or visible leaks, with dates and circumstances. Include recent thermostat changes, filter replacements or building work. If more than one appliance has been affected, say which ones and when. These details help the technician understand the sequence without presuming a shared cause.

Provide the model and serial information only if it is safely available from ordinary access or previous records. Do not remove panels solely to obtain a photograph. Keep any error code you have already observed, and avoid repeated resets that may change the visible information before the professional attends.

Ask what was checked and what happens next

Request a written explanation of the visit's findings and any recommended repair. If work is proposed, ask which issue it addresses, whether continued operation is appropriate and what the quoted scope includes. Distinguish a recommended improvement from an urgent safety finding. Do not infer either category from a brief sales description.

Ask for the approved filter reference and maintenance interval to be recorded. If the contractor identifies a restriction or requires equipment to remain out of service, follow their instructions and arrange the stated next step. A second opinion can help with a major non-emergency decision, but it is not permission to override a safety restriction.

Keep one durable maintenance history

Store invoices, findings, warranties and owner instructions together. Record the date and the attending business rather than simply marking serviced on the calendar. At the next visit, make the previous findings available so recurring concerns can be discussed in context.

For a Toronto enquiry, include the postal code, housing type and whether the request is preventive maintenance or an active heating fault. Confirm timing, price and provider details before treating a conversation as a booking. If a CO alarm sounds or a gas leak is suspected, leave and use emergency channels rather than waiting for a scheduled maintenance reply.

Service enquiries are limited to eligible low-rise Toronto homes with an individual furnace. Check the postal-code territory before sending a request; being within Toronto does not by itself establish coverage. High-rise properties and shared central heating are excluded.

Primary references

• TSSA contractor registration and certification
• TSSA authorized heating fuel contractors
• TSSA annual inspection and avoiding false inspectors
• Lennox product manuals

Reviewed October 7, 2026. Equipment-specific instructions take priority.