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Old 07-29-2016, 02:56 PM   #1
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Dometic AC Unit cycling odd

Hello again to these great forums!

Having an odd problem with our passport GT 2400BH dometic AC unit.

When the AC is running it hits the thermostat set temp the AC unit fan will come on for few seconds and the unit will completely shutoff. Once the temp goes above the thermostat set temperature cycle will continue with no problem.

Today, when the thermostat reaches it set temperature the unit fan will come on like it's going to kick off AC comes back on makes like a hammy noise nothing shuts off like it did before.

It is hotter outside today.

Odd thing is when I set the thermostat to 85 is cycles just fine when I have it any lower then 76 it starts acting up.

I have the thermostat fan on AU mode since our unit has a fan... I checked low and high fan and cycles fine.

Any thoughts?

Thanks ahead of time for any help!
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Old 07-29-2016, 03:58 PM   #2
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Set on automatic, the fan will come on at a different time than the compressor so that both motors don't draw high amps at the same time. The fan will stay on a bit longer because it's moving the chilled air until the evaporator temperature is lower. You might try putting the fan on a continuous setting to make sure the evaporator isn't icing up. It also will give you more even temperatures through out the RV.
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Old 07-29-2016, 08:36 PM   #3
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we had cycle problems when we tried to push more AC air down the ducting... we found that the evaporator would freeze up with the slower air movement and than we'd have odd behavior.. once we opened the vents on the side of the unit and let it run at full air movement we had better cooling..
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Old 07-29-2016, 08:37 PM   #4
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It's just the fan switching from low to high setting and back and forth. The fan switches to the low setting when it's only a couple degrees from the set temp. If the temp in the trailer is hovering around that temp it will cycle between high and low and do exactly what you're describing. To stop it from doing that just manually set the fan to high or low.
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Old 07-30-2016, 06:03 AM   #5
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More technical here after doing some more research.. When I have the thermostat set at AU ,lo or hi with a set temp say 72, and the inside rv temp reaches 72..The compressor would shut off, and the fan runs for a min or two then the fan shuts off. This is normal operations. Assuming..has been acting like this since we purchased the rv.
The issue is when the inside temp reaches the desired temperature set by the thermostat the compressor kicks off, the fan runs for the min or so then the fan shuts off there is a humming noise and the compressor kicks in again. Like cycling?

We always use the ducts. The behavior also occurred when we had the central vent open.

All last night it ran in "normal operations".

Thanks for all the help thus far!
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Old 07-30-2016, 09:41 AM   #6
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Quote:
Originally Posted by josh409 View Post
The issue is when the inside temp reaches the desired temperature set by the thermostat the compressor kicks off, the fan runs for the min or so then the fan shuts off there is a humming noise and the compressor kicks in again. Like cycling
Correction from the above statement:

temperature set by the thermostat the compressor tries to kick off the fan never comes on there is a humming noise and the compressor kicks in again. It appears if I set the thermostat to anything above 80 it cycles normal. During the day (hotter) it acts like this, and at nite it cycles normal compressor kicks off fan comes for a min whole unit turns off
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Old 07-30-2016, 10:14 AM   #7
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The starting capacitor is used by the compressor and the fan, I believe. I'd check and see if it's bulging or shows other signs of failure. That could be the reason for the humming and hesitation to start.

Be sure to discharge the capacitor before trying the tests in this video.

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Old 08-01-2016, 08:11 PM   #8
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Mine does this also. In auto the fan will start on high till it cools enough for the fan to go into the low fan mode. The fan will shut off but the compressor will stay on and humm in between modes as it switches from high to low. My 15000btu froze up one night and damaged the compressor and had to be changed out. I keep mine on low and let the compressor cycle on and off.
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