Cointra Overheat and Lockout Without Displayed Code

Furnace starts but shuts down after a few minutes, with warm air initially then cool air.

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

Restricted airflow, Failing circulation fan motor, Dirty heat exchanger, Incorrect fan speed setting

Safety: Turn off power before inspection.

Steps:

Check airflow: Ensure all vents are open and filters are clean.
Inspect fan operation: Observe the fan during operation. If it starts late, runs slowly, or stops early, the motor or capacitor may be failing.
Clean internal components: Vacuum dust from the fan housing and heat exchanger.

Professional help: A technician should verify fan speed settings, motor current draw, and safety device operation.

Medium 3/5

Circulation Fan Motor

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