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Old 07-04-2009, 08:36 AM   #1
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A/C Units switching to Heat

I have a 2009 Monaco Camelot with 3 Penguin A/C Heat Pump units (630516) with a Duotherm CCC. This morning I got up at about 0700 and the coach was about 73 degrees Normal), outside was 71. Got the paper, sat outside for about 90 minutes and my son wakes up and tells me the coach is hot. The interior is now 80 degrees, outside is 73 degrees all three units are discharging hot air. The CCC has been set to 72 degrees, A/C and fan in AUTO for all three zones, the system has been working fine since last Friday 6/26.

So far I've:

Cycled power to the A/C units
Cycled the on/off switch on the CCC
Tried multiple mode shifts
Checked the fuse for the thermostats--it was fine
Called Coach Net--they couldn't help

After all of that 1 A/C still blows hot, the other two seem to be in a fan mode--they blow air but it isn't cool.

I haven't reset the CCC by pulling the fuse yet--we don't have internet at the CG and I found out about that trick this morning after I found a WIFI hot spot. Naturally being the 4th none of the local service centers are open--oh well.

Any other advice or recommendations appreciated.

2009 Monaco Camelot
2015 RAM 2500
Blue Ox Aventa LX
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Old 07-04-2009, 09:25 AM   #2
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I am not an expert. However I will restate the obvious just in case it helps. The units are not following the thermostat temperature settings. Even if the A/C goes into a Heat mode by default if something fails it is not following the temp setting. This leads me to believe that the A/C unit is in a default mode, Heat On, to at least let you keep things from freezing if you are in a cold environment. You would need to turn the unit off to regulate the temperature yourself. If the units can be selected OFF at the thermostat I would think the wires between the thermostat is okay, Unless just the Temp Setting wire is open.
Do you have a Remote Control for the system?

2005 Monaco Knight, 3 Slide, 38' PST, Cummins 330 ISC, 34,000 miles on this one!
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Old 07-04-2009, 10:32 AM   #3
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I would suspect a faulty or confused thermostat from the symptoms you describe. All three units doing pretty much the same thing points to the thermostat or possibily a loose sensor wire. There is a procedure for resetting the thermostat that can be found in the penquin service manual.
Dawn and Mark

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Old 07-05-2009, 10:16 AM   #4
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CaptPat, you should try resetting the T'stat by turning it of, hold the zone and mode buttons down and turn it back on. Reset the modes of each zone to off and then to auto cool. Let us know how it responds.
Mike, RVIA & RVSA Certified Master RV Technician
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Old 07-06-2009, 01:19 PM   #5
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Thanks everyone, reseting the thermostat did the trick. Sorry for the delay in response the CG WiFi was down.

2009 Monaco Camelot
2015 RAM 2500
Blue Ox Aventa LX
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Old 07-06-2009, 07:00 PM   #6
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Glad to hear that solved it. I've heard a couple of reports of those thermostats going wacky lately.

Gary Brinck
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