A thermostat not turning on heat usually points to lost power, incorrect settings, or a control/wiring fault between the thermostat and your HVAC. The most common cause is simple power loss from dead thermostat batteries or a tripped breaker that cut power to the furnace or air handler. Other times, the thermostat is calling for heat but a safety switch or control board stops the system, or the wiring to the R/W terminals is loose. Our electricians regularly integrate smart thermostats with HVAC systems throughout the Rochester area, including Churchville, and can verify low‑voltage wiring, system power, and code‑safe operation.
Try these quick checks before scheduling service:
- Set to Heat and raise setpoint at least 3–5° above room temp.
- Replace thermostat batteries or confirm the display is on.
- Check furnace/air handler switch and the HVAC breaker.
- Close the furnace door fully; many units won’t run if it’s ajar.
If you smell gas or burning, turn the system off and leave the area before any troubleshooting.
Updated: 2026-07-31
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