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Old 10-22-2017, 11:09 AM   #1
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Basement A/C questions, having issues.

Hi iRV2,

We just picked up a 2000 Winnebago Adventurer with the basement AC. We are having issues so wanted to see if someone could pass along a little working knowledge on this type of system.

Information we got with it says RVP Products 6636 package air conditioner. The dealer we bought it from said both compressors were replaced about a year ago... for what that's worth.

Anyway, here's what I know at this point.

I opened up the control panel the other day and there's a wonderful amount of black soot in there along with a partially melted capacitor so pretty sure that's part of the problem. Insulation is fried on one jumper wire too.

The system only runs on one compressor from what I can tell. Every so often I can hear the other compressor try to start then shut off again within a few seconds. Maybe a start capacitor?

The main issue seems to be the outdoor fan. Sometimes it won't start with the system and other times it will start then shut off after maybe 2 or 3 minutes. The compressor keeps running though and everything heats up really quick. I can usually hear the outdoor fan shut off and I turn the system off at that point.

The thermostat inside is kind of screwy. It's a Coleman RV Comfort.PHP. The digital display is messed up and it seems to have a huge temperature swing.

When the outdoor fan runs it cools reasonably well and will maintain the temp. Best guess is about 3 or 4 hours of continuous run time and then the outdoor fan shuts off.

I don't know how much of the system is directly controlled by the thermostat and how much by the control board in the unit itself. If the thermostat plays a big part I might try replacing that before starting to swap parts in the unit itself. Just don't know enough about the system so any suggestions would really be appreciated.
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Old 10-22-2017, 11:35 AM   #2
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Well you have got several issues, the bad capacitors and the bad contacts. The outside fan (condenser fan) must run or high head pressure will shut off both compressors. So get all of the capacitor replaced could be four or more of them, replace any damaged contractors, lube out side fan (it may need replacement if it's bad). Then try that out
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Old 10-22-2017, 11:36 AM   #3
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Out of curiosity, at the time you purchased the coach, did the dealer tell you that everything worked? Better yet, is it in writing? Did they offer a short warranty period?

Of so, maybe they'll fix it for free.
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Old 10-22-2017, 11:40 AM   #4
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Can you take it back to the dealer. I would think if you just picked it up it would be covered.
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Old 10-22-2017, 11:40 AM   #5
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A basement unit cost about 2600$ plus install, so repairs may be worth while
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Old 10-22-2017, 12:00 PM   #6
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Go to wed page http://www.rvcomfort.com/pdf_documen...6294_copy2.pdf and you will find electrical drawings and help text
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Old 10-22-2017, 12:14 PM   #7
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When you look into getting these units repaired they are really household units and should be worked on by a household A/C tech.

There is a member here that has extensive PDFs on removing it from under the coach to be worked on but I can't seem to find my bookmarks.

It was my understanding that replacement compressors aren't available and the whole unit has to be replaced. I could be wrong but if they replaced with the wrong equipment that could explain the state of the electrical.

You also have to use a compatible or exact thermostat. again had info on that too and it is sadly gone.

Also running it at all with the external blower not working will cook what is left of your system.
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Old 10-22-2017, 01:34 PM   #8
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Lots of help here http://www.irv2.com/forums/downloads.php?do=cat&id=3

I have a lot more PM me an email address.
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Old 10-22-2017, 03:01 PM   #9
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Hi ! Welcome to IRV2! We're sure glad you joined the gang!

Congrats on the new rig! I don't know anything about basement air but just wanted to say hello. Keep her between the ditches!

Good luck, happy trails, and God bless!
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Old 10-23-2017, 04:20 PM   #10
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Wiring diagram and service manual were a huge help! Not an electronics whiz but worked on copiers long enough to be able to read a circuit diagram.

The OD fan would shut off as soon as the high speed relay kicked in. Found the inline fuse for the high speed circuit and it was blown. Wife is out trying to find the correct slow-blow fuse for it but not having much luck. There was a regular glass fuse in there. Hope this will at least get us up and running then can deal with the rest later.

Have been bumping the thermostat down degree by degree to avoid kicking in the second compressor. The second compressor triggers the high speed relay for the OD fan.

Haven't figured out what specific parameters on the thermostat trigger the second compressor though. Difference between set and room temp??

Will replace the fuse and hope it doesn't just blow again.


As far as the dealer, we're about 1500 miles away at this point... Texas to Florida. It was working fine to begin with but started exhibiting this problem a couple weeks in. We bought it knowing it had a bunch of little issues we would have to fix but I'll tackle about anything if the price is right.
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Old 10-23-2017, 04:25 PM   #11
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I had the same unit in our 2006 Itasca and if I remember correctly the second compressor will kick in if the called for temp is more than 2 degrees different from the ambient.

PS: I still have the PDF service manuals and a detailed step by step PDF on how to remove the whole unit if you ever need to. PM me with your e-mail address and I'll e-mail them to you since they are too large to post here.
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Old 10-23-2017, 05:12 PM   #12
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I've only had two problems with mine. First the jumper wire on one of the compressor relays was burned, I replaced both jumper wires. About a year later the #2 compressor relay went bad and I replaced it with one from Allied Electronics, cost about $10 for both repairs.
Watch your board when starting. The green LED on the left side should come on immediately and stay on. The red LED on the right should come on when #1 compressor starts then go off when #2 compressor starts and the red LED in the center should come on and stay on.
Replace the damaged start capacitors first then go from there.
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Old 10-24-2017, 06:26 AM   #13
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First turn off the circuit breaker for compressor #2. The unit will run fine on compressor #1 only, been there done that. Then go to Amazon and order 2 SUPCO SPP6 hard start caps and replace the old fried ones. With the correct fuse for the blower that should get you back in business. Had the same issue as you with compressor #2 trying to start and kicking in and out. The new start caps fixed that.
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Old 10-27-2017, 12:27 PM   #14
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i have been working on my basement heat pump for a number of years. All parts are readily available. The unit is easily removed. They are good units just take some learning to repair when they do break down.There is a diagnostic sequence that works very well.. Good luck..
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