Record the pattern
Tell the contractor how often the furnace starts and stops, whether the home reaches the thermostat setting, and whether the pattern is new. Note visible thermostat messages and whether the issue affects all rooms.
Do not bypass a safety switch, repeatedly force resets or open equipment to inspect components. Controls, airflow, equipment sizing and other faults can produce similar symptoms, so a diagnosis matters.
Describe what changed
Mention recent thermostat work, renovations, filter changes or servicing. If you know the equipment model and approximate age, provide those details. Explain any unusual noises or odours, and use emergency guidance immediately for gas odour or a CO alarm.
Ask what the repair will solve
The proposed repair should connect the observed symptom to a tested cause. Ask about follow-up operating checks and whether the technician identified any separate duct or control concern. If replacement is proposed, request the sizing explanation for the new system.
Sources & further reading
- FortisBC — Appliance maintenance and safety
- Technical Safety BC — Find a licensed contractor
- FortisBC — Smell gas? Get out.
- Technical Safety BC — Carbon monoxide safety
Prepared by the BC Furnace Repair editorial team using the official sources linked above. Reviewed November 5, 2026. General planning information; a qualified contractor must assess the equipment and property.