Furnace Repair
A furnace blowing cold air in Parker, CO usually means the fan is running but the burners are not lighting or not staying lit. Sometimes the cause is a thermostat setting. Sometimes it is a part that has worn out. Here is how to tell the difference.
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Fan set to ON. The fan runs all the time, so you feel cool air between heating cycles.
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Dirty flame sensor. The burners light, then shut off within seconds while the fan keeps going.
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Failed hot surface ignitor. The furnace tries to start but never lights.
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Limit switch tripped. The furnace overheated, shut the burners off, and kept the fan on to cool down.
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Dirty filter. Poor airflow is a common reason the limit switch trips.
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Pilot light out. Older furnaces with a standing pilot will not heat if the pilot has gone out.
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Set the thermostat fan to AUTO, not ON.
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Make sure the thermostat is on Heat and set above room temperature.
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Replace the filter if it is grey or clogged.
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Wait a few minutes. Many furnaces blow cool air briefly before the heat exchanger warms up.
Do not try to relight a pilot or adjust gas parts yourself. That is work for a contractor.
Call if the air stays cold after the checks above, if the furnace starts and stops several times, or if it clicks without lighting. These point to the flame sensor, ignitor or limit switch. In Parker, Colorado, cold nights make this a problem worth solving the same evening if you can.
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You call the line and describe what the system is doing.
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Your call goes to an independent local HVAC contractor who serves Parker.
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The contractor asks a few questions and sets up a visit that suits you.
Most furnaces run the blower for a short time before the heat exchanger is fully warm. A minute or two of cool air is normal. If it never warms up, something else is wrong.
Yes. A dirty flame sensor cannot confirm the flame, so the furnace shuts the gas off for safety. The fan may keep running and push cool air through the vents.
If it keeps cycling without heating, turning it off and calling is reasonable. Leave the thermostat on Heat once the contractor is ready to look at it.
Still feeling cold air from the vents? Call (303) 647-3227 and we will connect you with an independent local HVAC contractor who handles furnace problems in Parker.
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