Tools That May Help
Before calling a professional, these common tools may help you check the issue safely.
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Problem
Thermostat responds but furnace does not start.
Common Symptoms
- Weak airflow from vents
- System running constantly
- Uneven indoor temperatures
- Higher energy bills
Possible Causes
- Wiring issue
- control board fault
- ignition problem
How To Fix It
- Check wiring
- reset system
- inspect control board
Safety Tip
Always shut off power to the HVAC system before inspecting wiring or internal components.
When To Call A Professional
If thermostat works but furnace won’t start, call a professional
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