Furnace Not Producing Heat
Common Symptoms
Furnace running but blowing cold air
Furnace not turning on at all
House temperature dropping
Thermostat calling but no response
Blower running but no heat
Possible Causes
Several factors can contribute to this problem. Understanding the cause helps determine the right solution.
1Pilot light out or ignition failure
2Thermostat issues
3Dirty air filter
4Gas supply problem
5Tripped safety switch
6Faulty flame sensor
7Blower motor failure
What You Can Check First
Before calling a technician, try these simple checks that may resolve the issue.
1
Check and replace air filter
2
Verify thermostat is set to 'heat' and temperature is above current reading
3
Check circuit breaker and furnace switch
4
Look for flashing error codes on furnace
5
Verify gas supply valve is open
When to Call a Professional
Gas smell present (evacuate and call gas company first)
No error codes but still no heat
Ignition attempts fail
Safety switch keeps tripping
Heat exchanger concern
Experiencing any of these situations?
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