Question about Dometic Rooftop RV Air Conditioner
Most compressor units have a double capacator . If one half goes bad,
either the compressor will run without the fan, or vice versa. Those big capacitors can be nasty. First step on any system with
capacitors is to short them out. Use a plastic handled screwdriver.
Touch a blade to one terminal of the capacitor and pivot it to touch
the other. Do that with each one. Mid range Multimeters do not work
well checking capacitors. Best thing is a good one with a capacitor
checking function. Follow directions. With a cheap analog meter, put it
on ohms and connect the leads while watching the meter. The needle
should swing toward 0 initially and slowly creep back to infinity. Most
air conditioners have a double capacitor in one case. It is almost
quicker to check both than identify the one for the fan. If the motor
turns freely and does not look obviously burned and the capacitor
checks bad, likely it is bad and may well be worth replacing even on
such an old unit. An Dometic dealer or an electrical supply house may be
the best place to check for a new one. Just take the the old one in and
let them match it up. I am not sure about that SuperBoost (brand name)
relay and hard start capacitor. If it is bad, try removing it, and see
if starts without it. Otherwise, maybe a friendly supply house will
The Dometic Corp.
2320 Indust. Parkway
Elkhart, IN 46516
46 Zatonski, Unit 3
Brantford, ON N3T 5L8
Posted on Jun 26, 2009
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Posted on Jan 02, 2017
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