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Old 02-07-2019, 03:10 PM   #1
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13,500 Dometic A/C

2005 DSDP 3815

Rear a/c cycles on about a minute and half then shuts down.. shuts down for 3-4 minutes then comes back on and repeats .. anyone have ideas ..

Thanks in advance... Sharon

We are in Mission, TX ..Bentsen Palm Village RV Resort
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Old 02-07-2019, 03:16 PM   #2
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Are you running the AC or the heat pump? What is the outside temperature?

If you're running the heat pump and the outside temps are below 40F then the unit will freeze up, thaw, freeze up again etc.
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Old 02-07-2019, 05:16 PM   #3
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Hi Sharonkay,
Welcome to the Newmar owners forum. In addition to the questions asked, is the coach new to you or have you had it a while? Is this a new problem or has it always done this?
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Old 02-07-2019, 05:20 PM   #4
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And another question .... does the front A/C work OK?
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Old 02-07-2019, 05:43 PM   #5
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Move your thermostat another two or three degrees and see if it stops short cycling.

My AC's act just like that.
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Old 02-07-2019, 09:02 PM   #6
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2005 dsdp 3815

Thanks for the reply’s.....

Juergen & Margot————it’s The A/C (rear) OAT is 85 F

Gary———————————We bought the coach new in 2007 it had never been
Sold. New problem. Front A/C works fine

Myron & Deborah—————Will try and move temp up or down see if it still does
same

Thanks Sharonkay

Will post when I get it fixed
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Old 02-08-2019, 04:58 AM   #7
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I don't know your coach...so I'm grasping for ideas...

There are a couple of items that may shutdown the a/c unit....

IF the refrigerant level is low, a safety cutout (pressure switch) may be activated...if the system cycles evenly...I'm guessing this is the problem. It's designed to keep your compressor from burning out due to low refrigerant level.

If you are connected to a 30A shore power source and your coach is equipped with a Power Control System... there is a hierarchy of items that it can shed to prevent overloading the electrical system. Newmar commonly configures certain high draw items to "shed" during a high demand period. This is to prevent nuisance circuit breaker trips. In the normal order... Engine Block Heater, AC Water Heater Element #2, AC Water Heater Element #1, Air Conditioner #3 (if installed), Air Conditioner #2, Air Conditioner #1. If you are on 50A shore power...there shouldn't be a situation really to shed the Air Conditioners. IF you are on a 30A power connection...the system will shed the rear air conditioner at times...

if everything was working properly before...these are two likely culprits...
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Old 02-08-2019, 06:24 AM   #8
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Hi Sharonkay,
I am surprised you have not noticed this before. The bedroom is considerably smaller than the living/kitchen area of the coach. The HVAC will do its job much faster in the bedroom than in the front. (FYI, I know they are connected). Assuming everything is in working order it is what it is. However, one can make an adjustment to lessen the cycling. Find the thermistor that senses the air temp. I'll bet it is located along one of the bedroom walls (maybe an exterior wall?) or by the TV. This is what I did.
1. Purchase a new thermistor with a long cord.
2. Up on the roof remove the shroud covering the compressor unit.
3. Disconnect the current thermistor and connect the new thermistor.
4. Feed the thermistor and wire into the AIR RETURN HVAC duct. This is the one with the filters in each opening in the ceiling. Feed the new thermistor down through the most rear filter opening.
5. Thermistors are very sensitive. To desensitize the thermistor buy a package of electrical shrink wrap.
6. Slip one of the electrical shrink wraps over the thermistor. Tape the new thermistor to the bracket that the filter snaps into.

The above should extend the cycle durations of the unit.

The above was the only thing that worked for me. A much easier method to desensitize the original thermistor is to put tape over the holes in the "bubble" that houses the thermistor. This did not work for me because my original thermistor is locater on an outside wall (drivers side). With the coach facing north, in the morning we couldn't get the HVAC unit to come on or it would short cycle until after lunch. In the evening we could not get it to shut off (driver's side facing west).

Hope this helps.
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