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Old 01-12-2025, 06:25 AM   #1
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Dometic Dripping Sound

One of my Dometic heat pumps is making a dripping noise when fan runs regardless if heater is on. Just started and have yet to go on roof to look at it.

First thoughts on things I should look for?
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Old 01-12-2025, 07:00 AM   #2
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Sounds like water intrusion and nothing associated w/the heat pump or fan operation. Although if it only happens w/the fan running, it may be blowing water around inside the unit.

Is there snow on the roof or have you driven through rain or snow recently? If it is water intrusion, it may not necessarily be in the vicinity of the HP. It may be elsewhere and it's working itself to where you’re hearing the drip. Check all roof components’ seals and reseal if you find gaps or cracks. Recommend Dicor self-leveling sealant.

If you can’t find anything w/obvious signs of water intrusion, remove the HP’s cowling and check for water inside the unit. Warning: remove all power from the coach (shore, chassis battery disconnect, & the other batt. disconnect by your entry door), but note that the capacitors in your Dometic are still charged.

Good luck
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Old 01-12-2025, 07:06 AM   #3
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Quote:
Originally Posted by OMMM4747 View Post
Sounds like water intrusion and nothing associated w/the heat pump or fan operation. Although if it only happens w/the fan running, it may be blowing water around inside the unit.

Is there snow on the roof or have you driven through rain or snow recently? If it is water intrusion, it may not necessarily be in the vicinity of the HP. It may be elsewhere and it's working itself to where you’re hearing the drip. Check all roof components’ seals and reseal if you find gaps or cracks. Recommend Dicor self-leveling sealant.

If you can’t find anything w/obvious signs of water intrusion, remove the HP’s cowling and check for water inside the unit. Warning: remove all power from the coach (shore, chassis battery disconnect, & the other batt. disconnect by your entry door), but note that the capacitors in your Dometic are still charged.

Good luck
Thanks for the quick reply. We are in Indio, CA and the last rain was about two weeks ago. It was light rain. The coach has been stationary since August 29.

Interesting that your reply is focused on water. That is a big help to me in that I was concerned that it might be coolant fluid.

Thanks very much.
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Old 01-12-2025, 07:18 AM   #4
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One of my Dometic heat pumps is making a dripping noise when fan runs regardless if heater is on. Just started and have yet to go on roof to look at it.

First thoughts on things I should look for?
Tony, I'm assuming you have no signs of water intrusion from the AC unit. Try changing fan speeds to see if the sound changes. It's possible the fan assembly is making the "dripping noise" internally. If the sound changes with fan speed, I'd pull the shroud and try to pinpoint if motor or impeller wheels are making the noise.
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Old 01-12-2025, 07:39 AM   #5
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Tony, I'm assuming you have no signs of water intrusion from the AC unit. Try changing fan speeds to see if the sound changes. It's possible the fan assembly is making the "dripping noise" internally. If the sound changes with fan speed, I'd pull the shroud and try to pinpoint if motor or impeller wheels are making the noise.
Always use Low fan speed. Just turned on to High fan speed and no noise. Went back to Low fan speed and no noise. Maybe it went away, which would imply a water intrusion (condensation). I will wait until the heat comes on and see what happens.

Kevin, what NIRVC is doing to reach out to the displaced folks from the LA fires is great. Luckily here the winds have headed westward thus we don't have any smoke. Until this week Indio has had zero wind all season.
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Old 01-12-2025, 09:01 AM   #6
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If it was water intrusion, it didn't go away, it just ran out of water and you may have the beginnings of mold and/or corrosion in the empty space up there, not to mention you still need to find and plug the hole.

You mention 'heat pump' but not whether you were using the HP or furnace. Notwithstanding, even if on HP, if it gets cold enough, your Dometic automatically reverts to furnace mode and uses the hydronic heating system if it's too cold for HP operation so don't rule that out. Easy way to tell is to check the reservoir level in the engine compartment. If it's low, you need to refill to avoid damaging (cooking) your hydronic heater and look for the leak inside the Dometic unit. Taking a white paper towel w/you will help determine if any moisture you find is clear or if there's any color to it.

Good luck
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Old 01-12-2025, 02:44 PM   #7
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If you're hearing a "splooshing" noise when using your heat pump, it means the outside coil is icing up and likely pushing liquid refrigerant back into the compressor. This usually means someone knocked the freeze sensor out of the coil, or it failed.
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Old 01-12-2025, 04:40 PM   #8
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You might be over diagnosing this. If you turn the pump off immediately after hearing the dripping and it stops, it's not a drip. It could be something expanding or with all the wind, a leaf or other object that got through the shroud.
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Old 01-13-2025, 07:14 AM   #9
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You might be over diagnosing this. If you turn the pump off immediately after hearing the dripping and it stops, it's not a drip. It could be something expanding or with all the wind, a leaf or other object that got through the shroud.
I agree with Don. Ours often had a “dripping” sound when the heat pump or AC cuts off….i have determined it is due to expansion and contraction of the ductwork or unit…. As I have never found any water and it stops after a short period of time.
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Old 01-13-2025, 12:17 PM   #10
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For peace of mind you can buy a moisture reader and use it around the unit. I bought one years ago for checking the amount of moisture in stored firewood to check how "seasoned" it was. I've had friends borrow it when shopping for used RVs.
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Old 01-14-2025, 08:10 AM   #11
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Always use Low fan speed. Just turned on to High fan speed and no noise. Went back to Low fan speed and no noise. Maybe it went away, which would imply a water intrusion (condensation). I will wait until the heat comes on and see what happens.

Kevin, what NIRVC is doing to reach out to the displaced folks from the LA fires is great. Luckily here the winds have headed westward thus we don't have any smoke. Until this week Indio has had zero wind all season.
Tony, any update on the dripping noise?

Yes, Brett Davis is very sympathetic to anyone displaced by natural disasters and opens up our campground facilities for temporary occupancy. He did the same for the Florida and Carolinas hurricane victims.
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Old 01-15-2025, 03:44 PM   #12
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Tony, any update on the dripping noise?

Yes, Brett Davis is very sympathetic to anyone displaced by natural disasters and opens up our campground facilities for temporary occupancy. He did the same for the Florida and Carolinas hurricane victims.
Hey Kevin, no more dripping noise. Maybe it was a condensation???
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Old 01-15-2025, 05:06 PM   #13
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Hey Kevin, no more dripping noise. Maybe it was a condensation???
Oh of course the moment I reply all is good, it started again. Happens when fan running. I think it something mechanical but it does operate just fine. Having Signature Coachworks come out to see it in the next week or so.
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Old 01-28-2025, 04:47 PM   #14
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I had what I thought was a dripping sound and eventually discovered it was the bathroom door moving ever so slightly while it was open and against the wall. When I touched the door the sound went away.
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