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07-14-2022, 06:39 AM
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#1
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2012 Itasca Suncruiser 37
Join Date: Apr 2018
Posts: 38
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Another Coleman Mach AC question
Hello again friends,
So, let me start by saying I am pretty handy with most repairs. However, when it comes to heat and AC I know how to turn it on and off. So once again I need advice from those with more experience than I. LOL
Yesterday I noticed the temp in the motorhome starting to climb. Both A/C's were running, so I thought. Turns out only the fan was running on my bedroom a/c. Once I figured it out, using the thermostat, i turned that a/c off and then back on. The compressor did not kick on. Did that a few times with no luck. Then not knowing anyrhing else to do, I turned off the main breaker off and back on at the fuse box. Turned the a/c back on and the compressor started. Has ran great all night starting and stopping on its own.
Are there services that need to be performed? I had heard that these are closed systems and you have to replace the entire unit if there is an issue.
Thanks again,
Dave
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07-14-2022, 12:46 PM
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#2
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Winnebago Camper
Join Date: Mar 2022
Location: East Central Florida
Posts: 26
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Since it did eventually come back, my guess would be a dirty electrical relay contact. The compressor current draw can cause the contacts to deteriorate over time and they might be cleaned up ( burnished, if not badly burned) or replaced. Unless you are really familiar with electrical/electronic components and circuits, you might want to leave it up to a professional. Most of the contactors are soldered onto the A/C control board.
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07-14-2022, 02:16 PM
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#3
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2012 Itasca Suncruiser 37
Join Date: Apr 2018
Posts: 38
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Thanks
Thanks for the info Ford1. I will definitely let a pro do that if needed.
Dave
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07-15-2022, 06:26 AM
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#4
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Winnie-Wise
Join Date: Jun 2014
Location: Somewhere On the Road
Posts: 375
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As you work through the diagnostics also consider 1) t-stats sometimes need a '12V reset' to operate properly (looks like you did that on the 120 VAC side - may need the same on the 12VDC side), and 2) a starting capacitor may be going bad...
Share what results - we all learn...
__________________
Steve
2015 Itasca Ellipse QD | 2014 Jeep Grand Cherokee
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07-20-2022, 04:37 PM
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#5
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Winnebago Camper
Join Date: Aug 2020
Location: Brevard County, FL
Posts: 25
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Unit Frozen
The compressor will turn off if the unit freezes up in high humidity. There is a freeze sensor "stuck" in eval coil visible from inside that can go bad. It's job is to cycle the compressor to defrost the system. If it happens again, I'd look at that. Running the fan on low in high humidity can also cause freeze up, which takes 20-30 minutes to thaw.
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07-20-2022, 06:36 PM
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#6
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Winnebago Master
Join Date: Jun 2013
Location: Full-timer/volunteer w/SOWERS
Posts: 2,740
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Quote:
Originally Posted by eaglelen
The compressor will turn off if the unit freezes up in high humidity. There is a freeze sensor "stuck" in eval coil visible from inside that can go bad. It's job is to cycle the compressor to defrost the system. If it happens again, I'd look at that. Running the fan on low in high humidity can also cause freeze up, which takes 20-30 minutes to thaw.
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I'm with you on this one. Very common problem. Cleaning the coils might help some. I remove the shroud and hose off the coil. As far as the cooling coil goes, I open the plenum box and brush it off. I have put pipe insulation on the pipes around the compressor to the coils. That seems to help also.
__________________
Rick & Melissa Young & Dawson (RIP), 2011 Meridian 40U, FL XCL, ISL 380HP/DEF, Al 3000 MH, 2014 Honda CR-V, SMI AF1, Blue Ox TruCenter & tow equip.,EEZTire TPMS.
Servants On Wheels Ever Ready. Best job we ever paid to do . (full time volunteers)
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07-21-2022, 06:05 AM
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#7
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Winnie-Wise
Join Date: Dec 2013
Location: West Georgia
Posts: 461
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In addition to all the good advice given here, I'd add one more check. That being the high pressure switch/valve. We could not get the compressor to come on and after days of bird dogging the problem, I had an A/c tech come by and he traced it down.
As the system is sealed the choice was to open the system, drain it remove the valve and install a new pressure valve and Shrader valve to restore the system. But as it was 6 years old the extended service company said to just replace the entire unit.
Actually the replacement of the whole unit itself once on the roof was very easy and only took about 20 minutes. Most of the time was using the lift to get the old one down and lifting the new unit.
I stripped and salvaged everything I could from the old unit for future repairs.
__________________
Joe a/k/a "Americanrascal"
2016 Winnebago Adventurer 38Q +tow dolly
8th RV to sit in our driveway in 50 years
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07-21-2022, 01:39 PM
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#8
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2012 Itasca Suncruiser 37
Join Date: Apr 2018
Posts: 38
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coleman Mach issues
Thanks for all the help everyone. I had more issues after posting this thread. We are in Arkansas where the humidity and temperature have been insane!
After posting my initial thread the AC froze up. Stopped producing condensation or cool air. I reluctently climbed on the roof, because I couldn't get a RV rech to call back. Anyway, it was froze solid. I took off the shroud and the cover for the evaporator coil. I allowed it to thaw and cleaned the coils a little bit but they looked good. I replaced the insulation over the coils and sealed it back up. Started working great.
Then I did some research on what makes them freeze up. I had purchased RV filters from "Filter Time". When I checked my return filters they were very dirty. I think the AC was not getting enough return air to work properly. It had only been 2 months since I replaced them but now I know to check more often. I would not recommend those filters for the Coleman Mach systems. I don't think the allow enough air flow. I replaced them with "RV AIR" filters.
Temp has been between 95-100 with heat index of 110 some days. Has been running strong and cooling. My lesson learned was keep an eye on those filters. For those that are not full-time I'm sure you can streach that time out between filter changes.
Again, thanks for all the help. Im sure I'll have more question. ![Smile](https://www.winnieowners.com/forums/images/smilies/smile.gif)
Dave
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07-21-2022, 02:07 PM
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#9
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Winnebago Camper
Join Date: Nov 2019
Posts: 7
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Quote:
Originally Posted by Armydave
Hello again friends,
So, let me start by saying I am pretty handy with most repairs. However, when it comes to heat and AC I know how to turn it on and off. So once again I need advice from those with more experience than I. LOL
Yesterday I noticed the temp in the motorhome starting to climb. Both A/C's were running, so I thought. Turns out only the fan was running on my bedroom a/c. Once I figured it out, using the thermostat, i turned that a/c off and then back on. The compressor did not kick on. Did that a few times with no luck. Then not knowing anyrhing else to do, I turned off the main breaker off and back on at the fuse box. Turned the a/c back on and the compressor started. Has ran great all night starting and stopping on its own.
Are there services that need to be performed? I had heard that these are closed systems and you have to replace the entire unit if there is an issue.
Thanks again,
Dave
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I had a similar problem, without going into all the details. I was told by
a Winnebago Rep. to replace the breakers or tighten the screws on the breaker. I tightened the screws and had no more problems. By the way one
of the pros didn't check those when I took it back to the dealer, he told me nothing wrong with the AC
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