Question about Dometic Rooftop RV Air Conditioner
Control box is not clicking fan upstairs moves freely
Sounde as if there is an open winding in the fan motor. There are two sets of windings in a fan motor. The start winding and the run winding.
Here is how you can tell if it is the start winding. Put the unit on and then take a stick and try turning the fan swiftly. If it does start and it could be in either direction, since you have already replaced the capacitors then if the start winding is open then you will need to replace the fan motor. Same goes if the run winding is open.
Posted on May 11, 2014
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Posted on Jan 02, 2017
Had one doing similar recently, and after a thunder & lightning storm. Nothing worked, but kept blowing 2 amp fuse in thermostat, when anything tried, heat or cool. Pulled plastic control box down from inside upper unit (AC) made sure breaker was off, took of plastic cover and smelled inside, and could smell burnt plastic smell. Replaced, control box, that got fan only working. Tried another thermostat , everything worked as it should. Turns out the lightning, or power surge, or whatever, shorted out the thermostat, and control box at same time.
Posted on Aug 14, 2008
SOURCE: will not shut off
Sounds like a stuck relay on the unit itself. Maybe there is a short in the control wire that comes from the thermostat that activates the fan.
The thermostat probably has one hot wire at all times. The thermostat then chooses which wire to send the voltage down based on your selection. One of those wires is probably for the fan only. Make sure that it is in good condition (no bare, pinched or wires)
Posted on Jun 17, 2008
SOURCE: dometic roof air
Sounds like the unit either has been miswired from the beginning or there is a stuck contactor relay.
The more rare scenario is that the control wire between the t-stat and the contactor is shorting to a power source causing the relay to energize. Good Luck!
Posted on Jun 23, 2008
you have to run a contractor grade extension cord(10-12 gauge) from your rv to run those or theyll do that, the lower the gauge the better, best bet is to plug the rv directly into the outlet, if you cant, get the shortest and thickest extension cord you can.
Posted on Aug 21, 2008
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