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Old 09-26-2010, 04:13 PM   #1
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Location: Omaha, NE
Posts: 398
Roof air fans

Here I go again, two steps forward and one step back. Fired up the beav today to give her a little exercise after 8 weeks of sitting (I know, I know). Details are 63F ambient, genny running, 120vac both legs, L1 shows 16 amps going to charger, turn both thermostats on temp 55F hear them click, wait couple minutes, L1 showing 32 amps, L2 16 amps, no fan either units. Checked breakers everything ok. Inverter disabled, not sure it matters. Turned off front thermostat and heard a whoosh sound from front unit. Did the same in back and heard the same sound. Changed mode on both thermostats to fan at high speed but nothing happening there either. Dometic AC's, I think.

Worked fine 8 weeks ago and now I'm out of ideas. I remember hearing that having children taught one patience but this MH is taking me to a whole new level.

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Old 09-27-2010, 05:50 AM   #2
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Try dropping the lower covers, and try turning the squirrel cage for the fan motors. If they're stuck, gently move them back and forth until they spin. Then turn the a/c units to "fan", and make sure the fans run. Then go to "A/C" and see what happens. I've seen start capacitors go out, and the fan will run if you give it a spin while powered up. I have not seen both fan capacitors go out on two A/C units at the same time.

Two wrongs don't make a right, but three rights make a left.

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Old 09-27-2010, 08:01 AM   #3
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Location: Leonard, TX
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Sounds like mice (or mud daubers); mice chew wires or build nests, daubers build nests. Either can immobilize fans as noted above. If bad wires, look at the common point first. That would probably be the wires that feed the thermostat(s) (or a common fuse if you are really lucky).
Ernie n Tara

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