Lennox heat pump cooling fan stops working after normal start


Old 12-28-13, 12:41 PM
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Lennox heat pump cooling fan stops working after normal start

I have a Lennox 12HPB48-6p, I have replaced the cap, defrost control board with a new one, and the fan motor. The unit starts, air starts to get cold, but after 1.5 minutes the outdoor cooling fan cuts off? This is why I replaced all the other parts and now and out of ideas, any thoughts?

Tried hooking the fan motor directly to the contactor, still cuts out?
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Old 12-28-13, 05:56 PM
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Welcome to the forums.

The pro in this forum would have moved your first thread for you. No problem.... here we are.

There are three wires between the fan and the capacitor and two wires to power. You actually moved the two fan wires to always live and the fan still shut off ?

Does the fan motor run excessively hot ? Could be a capacitor issue if you haven't changed it with the new motor.

Lennox installation/maintenance_12HPB-IOM.pdf
Old 12-28-13, 08:56 PM
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Did you install an OEM motor or a universal motor?
If you installed a universal motor post the FLA, HP (horsepower),RPM and voltage of your new motor.

Post this information for the old motor as well.

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