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Old 02-11-2018, 05:27 PM   #1
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AC problem

I have a ST 44 2015. Having problems with the berth AC units. About once a week I have to bleed the air out of the pump. The units go down on HI/PS. Anyone have ideas for a solution. I heard evaporator or condenser cores may be the issue. Not sure why when I bleed the pump the units work for a while?
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Old 02-11-2018, 06:10 PM   #2
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Similar issue with one of my main cabin AC's.
Going to clean/flush soon as the WX breaks.
Did you clean the filter?
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Old 02-11-2018, 06:17 PM   #3
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Back pressure due to fouling on the coil can cause the air in the system problem. Flush with Barnacle Buster or similar.

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Old 02-11-2018, 08:19 PM   #4
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Yes I did clean the filter, I am going to try the flush.

QUOTE=SOJOURN4;635346]Similar issue with one of my main cabin AC's.
Going to clean/flush soon as the WX breaks.
Did you clean the filter?[/QUOTE]
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Old 02-12-2018, 08:51 AM   #5
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One of my four units was doing the same. Going to flush with Barnacle Buster when I get a chance in a couple months.

Some additional advice from Dometic:

"I would recommend checking the wire connections at the high pressure switch to make sure they are secure to the pressure switch, and there is no corrosion which would cause a false reading. There should be two yellow wires connected to the pressure switch. Also, if you look in the electrical box, there is a green printed circuit board which will have the other end of the two yellow wires connecting to the high pressure circuit on the board. Make sure those connections are secure and no corrosion.

If all of the connections are good, and you have good water flow, you either have a true high pressure situation, or a bad pressure switch. You would need to connect a refrigerant gauge to the high pressure port to verify the pressure when faulting to determine if the pressure switch is good, or not.

You can jump the two wires at the pressure switch to verify all of the wiring is good. If the fault goes away, you know the wiring between the board and pressure switch is good. I would caution running it with the wire jumped, if the pressures are high it will continue to run due to removing the high pressure switch from the system. "
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Old 03-08-2018, 03:22 PM   #6
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Any easy way to clean the filter?
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Old 03-08-2018, 06:44 PM   #7
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Close sea cock
Remove intake line
Insert into 5 gal bucket (might need a temporary fitting/hose to extend)
Start AC unit
Run until fluid comes out of discharge @ hull
Turn off AC
Reconnect
Do same for other AC unit(s)
Get an adult beverage
After 6 or so hours open sea cocks and run AC for a bit to clean out Buster
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Old 03-08-2018, 06:51 PM   #8
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Meant the air filter but I am going to flush all four lines this spring. The pumps will prime and suck from a 5 gallon bucket? Thanks!
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Old 03-08-2018, 06:53 PM   #9
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Yes, did this a while ago and it fixed the problems I had with high pressure shut off. Used Barnacle Buster.
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Old 03-08-2018, 07:11 PM   #10
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Mystery-
I CAREFULLY remove the fabric filter, wash off, let dry and CAREFULLY re-install.

Yes on the 5 gal bucket suction
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