How often should I inspect thermostat & controls?
Inspect thermostat & controls at the manufacturer or authority interval, after severe weather or unusual operation, and whenever a documented condition changes.
What this means
Thermostat & controls covers power, readings, schedules, modes, and communication. Relevant observations include Thermostat screen is blank, Temperature does not match the room, Heating ignores the schedule, System runs with thermostat off, Smart thermostat is offline. The correct response depends on age, design, climate, usage, installation, recent work, and the exact manufacturer instructions; these observations narrow next steps but do not prove a failed part.
Safe checks
- Use the exact manual, warranty, local authority, and service history to set the interval for thermostat & controls.
- Add a check after severe weather, renovation, long vacancy, or unusual operation.
- Shorten the interval when a condition is changing or has recurred.
Stop and get help if
- Leave for a gas odour or carbon-monoxide alarm; stop for smoke, scorching, damaged wiring, or repeated breaker trips.
- Do not open combustion, refrigerant, high-voltage, or sealed compartments.
Which professional to call
Use a qualified HVAC technician when the condition exceeds safe user access or the visible checks do not explain it.
Find the relevant tradeSource and method
This answer combines HomeSOS's structured triage with safety boundaries supported by a public source. It does not replace inspection.
Health Canada: Home safetyReviewed August 12, 2026