Day & Night ECM Blower Motor Control Failure

Clicking from indoor unit but blower does not start; sometimes starts after several tries

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

Failing ECM motor module, Loose low-voltage harness to ECM, Faulty indoor control board fan output, Voltage dips at startup

Safety first: Turn OFF power to the air handler before accessing the blower compartment.

Step 1 – Reseat ECM harness: Disconnect and reconnect the multi-pin low-voltage plug on the ECM motor.
Step 2 – Check for moisture: Ensure the motor module is dry and not exposed to condensate leaks.
Step 3 – Observe startup: After restoring power, command fan ON and watch for delayed or failed starts.
Professional replacement: ECM motors and modules are expensive and require correct programming; replacement should be done by a technician.

Hard 4/5

ECM Blower Motor

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