Smart thermostat not turning on heat
4.5
The thermostat shows "Heating" but the furnace does not start.
Symptoms
- No heat
- Furnace silent
- Thermostat screen on
Possible Causes
- C-wire power issue
- Incompatible wiring
- Software glitch
Step-by-Step Fix
1
Check Wiring
Ensure the R and W wires are securely connected.
2
Restart Thermostat
Remove from wall and reattach, or use the reset menu.
3
Check Furnace Power
Ensure the furnace switch and breaker are ON.
When to See a Technician
Many smart thermostats require a "C-wire" for consistent power; without it, they may fail to trigger the relay.
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