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My Furnace Starts Then Stops

If your furnace runs for a few minutes and then stops, it can be really annoying and get really cold. More importantly, it could be the sign of a major HVAC problem that requires repair. That's where Repair Clinic comes in. After we help you figure out why your furnace blower starts then stops, we'll show you how to fix it. Your furnace problem might seem complicated right now, but that's only because you might not have any HVAC repair experience'yet. However, by the time you've used our troubleshooting guide and watched our professional repair videos, you'll have more confidence. And even if you still want to hire a HVAC professional, you'll save money buying the part from us. Remember, if you give up now, you'll be like that old furnace that tries and then just shuts down. Don't be like that.
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Common solutions for: Furnace starts then stops
Solution 1:
Flame Sensor
The flame sensor monitors the burner to detect whether or not a flame is present. If the flame sensor is defective, it might fail to detect a flame. If the flame sensor does not detect a flame, the co...ntrol board will shut off voltage to the gas valve to prevent the furnace from heating. Sometimes, if the flame sensor is dirty, it will fail to detect a flame. Try cleaning the flame sensor with a fine abrasive pad. If the furnace still doesn’t heat, replace the flame sensor.
Required Part
Furnace Flame Sensor
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Solution 2:
Control Board
The control board regulates the power supply to all of the components of the furnace. If the control board is defective, it might not send voltage to the ignition system, causing the furnace to shut o...ff after a few minutes.
Required Part
Furnace Control Board
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Solution 3:
Draft Inducer Motor
The draft inducer motor draws air into the heat exchanger and then exhausts it out the flue. The pressure switch senses a pressure change and closes a switch to signal the control board that the furna...ce has proper air flow. If the draft inducer motor is defective, it may be unable to close the pressure switch, causing the ignition process to stall and the furnace to shut off after a few minutes. If the ignition process stalls, the furnace will shut off. If the draft inducer motor is at fault, replace it.
Required Part
Furnace Draft Inducer Motor
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Solution 4:
Pressure Switch
The pressure switch closes when the burner has sufficient airflow. If the pressure switch isn’t working, it might not close when the proper airflow is present, causing the ignition process to stall. I...f the ignition process stalls, the furnace will shut off. To determine if the pressure switch is defective, use a multimeter to test the switch for continuity. If the pressure switch does not have continuity, replace it.
Required Part
Furnace Pressure Switch
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Solution 5:
Flame Rollout Limit Switch
The flame rollout switch monitors the heat surrounding the burners. If the inducer fan motor cannot draw enough air through the burners, or if the furnace is not venting properly, the rollout switch w...ill open to halt the ignition sequence and prevent the furnace from heating. When this happens, the furnace will shut off after running for a few minutes. To determine if the flame rollout switch is defective, use a multimeter to test it for continuity. If the switch does not have continuity, replace it. Be aware that poor airflow through the burner is often a result of insufficient ventilation or a restricted exhaust vent. Make sure that your furnace is in a properly ventilated location and the exhaust vent is clear of obstructions.
Required Part
Furnace Flame Rollout Limit Switch
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Solution 6:
Air Flow Problem
The furnace must have proper airflow through the burner in order to continue running. The furnace draws air from the surrounding area or from outside the room. If the furnace is located in a utility closet or in a cramped storage room, there may not be sufficient available air for the furnace to heat properly. If the furnace draws air from outside the home, check for an obstructions at the air inlet.