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Old 08-04-2021, 06:22 PM   #1
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Front DuoTherm stopped working ... Guessing start capacitor

Today while I was working on the DW's class B, she informed me that the Monaco had been alarming (via the Marcell). We had the front a/c running to keep the inside liveable while parked.
Checked to ensure the shore power was ok, and then that the breaker was ok. Then I checked the thermostat ... which kicked the rear a/c on correctly, so I checked it off as well.
Climbed up on the roof and popped the shroud. Checked the run capacitor with my multimeter (ohms) and it appeared ok. As I continued checked, ensuring all connections were tight .., I spotted what I think is the start cap down under the run cap. Following the red wire, I soon found the other end loose with a charred connector.
I'm going to try to attach two pictures, 1 with the cap down under the large cap, and the other with the loose burned/rusted/corroded end. If this is the problem ... any idea where it should be connecting? I don't see any obvious bare/charred connector .., but I ran out of time with rain starting ...

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Old 08-05-2021, 04:52 AM   #2
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Capacitors cannot be load tested with a meter - they may read good with a meter, but bad when put under the load of a motor.

That black plastic thing with the white and red wire going to it is a start capacitor. There will be a relay associated with it as well.

I suspect once you get the red wire reconnected that the compressor will run again.

Make sure there is a 10k, 2+ watt resistor across the top of the start cap or you risk welding the contacts of the relay together.
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Old 08-13-2021, 02:11 PM   #3
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well, after pulling the control box and getting a good look, the broken/burned wire was obviously from the small PTCR (positive temp coefficient resistor). It appears as though the PTCR sits between the start cap and the run cap ... but I'm not sure of that fact since the doggone electrical connection diagram does not show it at all.

According to the diagram, the white wire comes to the start cap from the run cap. That same terminal on the start cap also contains a black wire going to the reversing valve.
The other terminal shows a red wire from the start cap going to the Herm terminal on the run cap which then continues to the compressor.

Since the old PTCR had the terminal connected to the start cap burned off ... it's my assumption that the resistor sits between the start and run ... but I see no indication on which connection would be the "from start" and which is the "to run".
Anyone??
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Old 08-13-2021, 05:52 PM   #4
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The PTCR black start cap are wired in series.

They two wire coming off of that assembly hook to the two terminals of the run cap.

The PTCR is a thermal resistor - it has a low resistance when cool, a high resistance when hot. The heat is caused by the compressor current going thru the resistor.
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