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Old 09-06-2013, 10:48 AM   #15
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skater, if you have a slide switch for fhe temp setting the contacts may be worn or dirty. some electrical contact cleaner may help. if you take the control panel out, an electronics tech should be able to replace it. i had it done on my '94. think tv or ham radio repair shop.
It is a slide switch. Good thought. I'll just need to pull it apart and see what it looks like. (I'm pretty sure we don't have any repair shops like that in this area, unfortunately.)
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Old 09-06-2013, 10:54 AM   #16
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It is a slide switch. Good thought. I'll just need to pull it apart and see what it looks like. (I'm pretty sure we don't have any repair shops like that in this area, unfortunately.)
I'll bet you do, you just don't know about them.

My partner's dad has been repairing TVs in his garage for decades as a side business (he worked as a radio technician before he retired.) He lives far from any large city, and is signed up with a service that refers people for "factory authorized service" for warranty work, etc.

He gets much less of that work than he used to, because it often costs more to fix a flat-panel TV than to replace it, especially if it's a $499 Wal*Mart model. You could drive by his house and never know there was an electronics repair shop there.

Now, finding the one(s) near you without "knowing a guy who knows a guy" may be a challenge.
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Old 12-27-2013, 08:55 AM   #17
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I haven't played with the thermostat yet... Sometimes it works fine, like our current trip, other times it flakes on us. Voltage doesn't seem to be the issue, I'm not seeing any correlation there. We're using the heat strip this time.

Different question, though: Anyone know how much a heat strip should warm the air? The exhaust is 10-12 degrees F warmer than the intake. I never checked our B190's heat strip temperature but it usually produced very warm air compared to this one.
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Old 12-27-2013, 09:12 AM   #18
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Our Dometic Penguin A/C has a problem where sometimes the compressor just doesn't start, although the fan runs. When the compressor does work, the A/C works beautifully. Adjusting the temperature seems to make it start working again. Do you think this is a sign of a bad thermostat or board or something else?

Model number is 620215.321; I'm pretty sure it's original to our '95. Thanks for any suggestions. Some of the parts look expensive so I'd like to be reasonbly sure it will fix the problem.
The thermostat is just a switch. It is either in the open or close position, depending on temperature.
If the compressor is not starting but the fan comes on when the thermostat calls for cooling, it is most likely something else causing the compressor to not run. My guess is the capacitor is failing or low voltage.
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Old 12-27-2013, 10:04 AM   #19
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Originally Posted by Skater View Post
I haven't played with the thermostat yet... Sometimes it works fine, like our current trip, other times it flakes on us. Voltage doesn't seem to be the issue, I'm not seeing any correlation there. We're using the heat strip this time.

Different question, though: Anyone know how much a heat strip should warm the air? The exhaust is 10-12 degrees F warmer than the intake. I never checked our B190's heat strip temperature but it usually produced very warm air compared to this one.
I do not know the specifics about difference in temperature, but I have found that heat strips will not make the interior comfortable when it's really cold outside. The heat loss through the windows, door, and skin can be about the same as the heat output of the heat strip. It is only the same output as a hair dryer, about 1,600 watts.
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Old 12-27-2013, 10:07 AM   #20
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Have you tried just replacing the thermostat with a switch and see if the problem is still there? If it is then I would start looking at start capacitors etc. If it cures the problem then you need a new thermostat. I have had thermostats go bad before. The points get worn from arching. Sometimes they weld together or they don't make contact.

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Old 12-27-2013, 11:35 AM   #21
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If you have a Dometic Comfort Control thermostat ( CCC-1) you can not simply place a switch into the circuit to activate the unit. It is more than likely a heat pump, and the CCC-1 uses a 4 wire data cable with 12VDC coming into it on 2 wires and a digital signal to the control board going from the t/stat to the control board.

A simple test is to connect a new t/stat. You also might have. Bad data cable, bad union where the cable connects to the A/C control board, or a defective control board.
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Old 12-27-2013, 01:04 PM   #22
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90% of the AC problems I hear about on here are something about the CCC not working correctly. If it were mine I would put everything back under manual control.

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