The furnace starts normally but shuts off when the blower starts, then retries.
Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
Possible Causes
How to Fix / Troubleshooting
Safety: This symptom can indicate a cracked heat exchanger and a potential CO hazard. Install a CO detector if you do not have one, and contact a professional.
Homeowner checks:
- Room ventilation: Ensure the furnace room has adequate combustion air openings and is not tightly sealed.
- Filter and vents: Confirm the filter is correct and the vents are not excessively restricted.
A technician must inspect the heat exchanger, verify blower speed settings, and check combustion with instruments.
Repair Difficulty
Required Part
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