Duo Therm A/C Troubleshooting - non op fan
Model 57915.741 Dometic A/C 3107610.002 thermostat? After about 5 weeks of non use in the Florida heat, tried to turn on A/C, compressor ran but not fan- selected fan from "auto" to "on" and blew...
Forum Discussion
eHoefler wrote:
The capacitor is for the compressor, not the fan. Chances are the fan has a bad bearing and is not spinning freely.
Untrue and True!
Untrue: The FAN does use a Capacitor. It's a RUN Capacitor only. Compressor uses a RUN Capacitor as well, and in addition it MAY have a START Capacitor.
So, Always RUN Capacitors, for BOTH "motors" (Fan and Compressor). Some A/C's use two separate Capacitors, but many such appliances use a Two-in-One Capacitor. Usually around 05 mfd for Fan and about 35 mfd for Compressor. Easy to tell. The two-in-one will have three sets of connections. Singles will have only tow per capacitor.
Then IF there's a Start Capacitor, it is connected across ONLY the Compressor Capacitor (or that part of a two-in-one).
TRUE: Heartily agree the Fan Motor Bearings could be sticky, so the idea of rolling it over by hand to check, is a very good one. Those fan motors have very, very, little starting torque. Doesn't take much to keep them from being able to spin up.
