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Old 05-03-2018, 16:36   #1
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A/C reversing valve

The reversing valve on my Dometic/Marine Air 16,000 BTU A/C unit is irreversibly stuck. replacing the valve and repairing the unit would cost about half of what a new unit would cost. I have come to the conclusion that I really don't need the heating function of the unit. hence, do I really need the reversing valve?
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Old 05-03-2018, 16:44   #2
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Re: A/C reversing valve

From my very basic knowledge of the valves, as long as it is fully open to the cooling position and the AC functioning correctly then no you don't need it at all and can leave it alone.
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Old 05-03-2018, 16:57   #3
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Re: A/C reversing valve

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From my very basic knowledge of the valves, as long as it is fully open to the cooling position and the AC functioning correctly then no you don't need it at all and can leave it alone.

You are spot on correct there Skip.
Suggest removing the two wires to the reversing valve solenoid otherwise its coil may get hot if heating is ever called for.

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Old 06-03-2018, 14:12   #4
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Re: A/C reversing valve

Unfortunately, the valve decided to get stuck somewhere in between.
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Old 06-03-2018, 14:23   #5
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Re: A/C reversing valve

Have you tried tapping on the valve with the handle of a screwdriver? Don't beat it to death but a few taps sometimes will free up the valves.
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Old 06-03-2018, 14:25   #6
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Re: A/C reversing valve

Yes, I did.
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Old 06-03-2018, 14:26   #7
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Re: A/C reversing valve

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Unfortunately, the valve decided to get stuck somewhere in between.
Well gee, that's not good.

Before infusing dollars try tapping as suggested by DeepFrz. Also switching back and forth, heat to cool and if possible tapping at the same time. Repeat a few more times. Got nothing to lose.

One thought, are you sure you're getting power and full power to the valve? Just in case try checking the leads to the solenoid with a voltmeter.
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Old 06-03-2018, 14:44   #8
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Re: A/C reversing valve

If it's all metallic, you might try SOME heat. If the lines have enough "give" in them, I'd try really whumping it with a plastic mallet.

What do you have to lose ...
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Old 06-03-2018, 14:47   #9
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Re: A/C reversing valve

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Yes, I did.
Ok, if you are sure the problem is a stuck reversing valve, suggest having it removed and replaced with a short piece of copper tubing, evacuated and re-gassed. Whole job should take less than say 2 hours. Also if space allows it may be quicker / cheaper / easier to cut the copper lines to and from the valve and fit a flared filter dryer in its place. That would eliminate welding.

Cheers OzePete
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Old 06-03-2018, 14:59   #10
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Re: A/C reversing valve

I had a technician check the unit and he ruled out other possibilities than the reversing valve being stuck.
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Old 06-03-2018, 14:59   #11
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Re: A/C reversing valve

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Originally Posted by OzePete View Post
Ok, if you are sure the problem is a stuck reversing valve, suggest having it removed and replaced with a short piece of copper tubing, evacuated and re-gassed. Whole job should take less than say 2 hours. Also if space allows it may be quicker / cheaper / easier to cut the copper lines to and from the valve and fit a flared filter dryer in its place. That would eliminate welding.

Cheers OzePete

Seems like replacing the valve would only take a bit more time. The valve cost is only about $100.

For whatever reason, my experience with domestic HVAC men has been poor. Marginal skills, very inflated prices. So, everything short of pumping refrigerant I do myself.
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Old 06-03-2018, 15:00   #12
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Re: A/C reversing valve

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Originally Posted by TreblePlink View Post
If it's all metallic, you might try SOME heat. If the lines have enough "give" in them, I'd try really whumping it with a plastic mallet.

What do you have to lose ...
That has always been my philosophy, "If you can't fix it, get a bigger hammer."

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Old 06-03-2018, 15:04   #13
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Re: A/C reversing valve

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Originally Posted by TreblePlink View Post
Seems like replacing the valve would only take a bit more time. The valve cost is only about $100.

For whatever reason, my experience with domestic HVAC men has been poor. Marginal skills, very inflated prices. So, everything short of pumping refrigerant I do myself.
I believe this is a self contained AC unit. If so, it wouldn't difficult to disconnect the wires (mark and label EVERYTHING), remove the ducts and take it to a shop.

I don't think you would even need a marine AC tech. Any AC tech should be able to swap out a reversing valve. Doing the removal and hauling to the shop would save at least an hour of labor, or more.
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Old 06-03-2018, 15:11   #14
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Re: A/C reversing valve

Good stuff, OzePete - I'll discuss that with the A/C guy along with potentially preserving/reusing the refrigerant: that should hopefully lower the costs of repair and get me another few years at least of cooling out of the unit.
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Old 06-03-2018, 15:16   #15
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Re: A/C reversing valve

I was quoted a price of $ 500 for the reversing valve - another thing I need to take a closer look at.
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