Replacement AC fan motor very weak.
Short version: I just replaced a failed AC fan motor. Now the fan actually works BUT it runs at around 20% of the previous speed and blows air very weekly. Also, when I set the fan to auto instead of ...
Forum Discussion
IF the Impellors are on backwards, that will NEVER keep the motor from running at the correct RPM. I would suspect a BAD AC control board. The Tstat sends a signal to the upper Control Board and then the control board energizes the various Fan speeds. A quick way to determine is to get the Hi speed fan wire and connect to 120 volts(bypass the board). IF the fan runs at correct RPM, then your control board is bad. Unhook the Hi speed fan wire from the board and connect to 120 hot lead. You cannot use a voltmeter to test the output from the board. It will not register the output correctly. Doug
