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Old 03-20-2019, 07:55 AM   #1
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Roof A/C Condensate Pumps

None of the 3 on my units are working since I have water pouring off my roof. I have visually inspected all 3 of them, and being in the commercial HVAC business for over 30 years I can tell you thats not much of a pump! LOL.

Anyway, I do not see any blockage up there so I wanted to check in with others and see where they have had trouble in the past on these?
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Old 03-20-2019, 10:50 AM   #2
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Originally Posted by loydt View Post
None of the 3 on my units are working since I have water pouring off my roof. I have visually inspected all 3 of them, and being in the commercial HVAC business for over 30 years I can tell you thats not much of a pump! LOL.

Anyway, I do not see any blockage up there so I wanted to check in with others and see where they have had trouble in the past on these?
Never seen a condensate pump on a roof ac, mine just gravity drain through tubing to a point under the rear cap to the ground. If you do not have the tubing to the pan under the evaporator, it just goes out on the roof.
If your tubing is blocked, that could be the problem.
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Old 03-20-2019, 11:17 AM   #3
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Never seen a condensate pump on a roof ac, mine just gravity drain through tubing to a point under the rear cap to the ground. If you do not have the tubing to the pan under the evaporator, it just goes out on the roof.
If your tubing is blocked, that could be the problem.
We have three, they do go bad. Best thing to do is disconnect from the pump and blow into the line. If air passes it's not the line.

I had one checked by the AC guy and said it was locked up, not sure how they inspect.

They are also very easy to change. I have a spare.
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Old 03-20-2019, 11:47 AM   #4
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I too had never heard of an RV rooftop unit that utilized a condensate pump. Just looked and sure enough, at least one manufacturer does. I would be interested in knowing why a manufacturer would design a unit like this in the first place when gravity should work just fine.

On the OP's issue, it's hard to believe that all three units have a high condensate level/overflow problem at the same time. Or do all three units empty to a common pan housing the condensate pump? I wouldn't think that a single unit with the problem would cause all three units to stop working unless this was the case.

How bout this? Since water is shedding off the roof, the compressor must be running. I wonder if the something could be going on with the reversing valve(s). Again, not likely all three at the same time. There is more than one thermostat, right?

Sorry I can't help any. I am curious to see what you find though, as this is something I haven't run across with rooftop units..
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Old 03-20-2019, 12:32 PM   #5
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We have three, they do go bad. Best thing to do is disconnect from the pump and blow into the line. If air passes it's not the line.

I had one checked by the AC guy and said it was locked up, not sure how they inspect.

They are also very easy to change. I have a spare.
Do your pumps have to move the condensate up to empty out the tray? Just trying to visualize it.
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Old 03-20-2019, 07:22 PM   #6
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Originally Posted by loydt View Post
None of the 3 on my units are working since I have water pouring off my roof. I have visually inspected all 3 of them, and being in the commercial HVAC business for over 30 years I can tell you thats not much of a pump! LOL.

Anyway, I do not see any blockage up there so I wanted to check in with others and see where they have had trouble in the past on these?
Check the end covers (look like a perforated piece of tubing) on the condensate drain lines under the rear cap....they just pull off and can get clogged with crud over time but are needed to keep out the wasps and mud dauber when coach in storage. (The ones on my 14 Journey when new were full of styrofoam bits from roof insulation and one pickup line to the condensate pump was kinked due to poor ac install at the factory.). Have not had a problem with condensate pumps on mine since I corrected those issues.

Would seem very odd for all three to go bad at same time....just a thought - book does say water will run off on roof when using heat pumps vice AC....?
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Old 03-21-2019, 06:25 AM   #7
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Do your pumps have to move the condensate up to empty out the tray? Just trying to visualize it.
No more than a few inches. It's a small pump that sits in a tray under the coil. Not sure if it runs constantly or if there is a level switch. But it lifts the condensation a few inches up in a 3/8" tube and empties into a 3/4" line and it's all gravity from there. I have seen several that dump into the engine bay. All three of mine come out just under the wet bay.

It does make life easier, no water dripping off the coach and you can tell which one us running by looking at the tube.
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Old 03-21-2019, 07:00 AM   #8
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Are you cooling or heating? The condensate pump only works in the cooling mode. You can get water on the roof when in the heating mode.
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Old 03-21-2019, 07:08 AM   #9
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Cooling mode. I was down in the Florida Keys when I noticed it. I checked all the lines on the roof and I also cleaned out the screens on the bottom of the lines near rear engine bay. I am going to blow out the lines just to be safe for the areas I cannot see. But I suspect these little cheap pumps have failed.

My previous coach (Monaco) worked the same way, but they were able to gravity drain and pumps were not needed.
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Old 03-21-2019, 08:14 AM   #10
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No more than a few inches. It's a small pump that sits in a tray under the coil. Not sure if it runs constantly or if there is a level switch. But it lifts the condensation a few inches up in a 3/8" tube and empties into a 3/4" line and it's all gravity from there. I have seen several that dump into the engine bay. All three of mine come out just under the wet bay.

It does make life easier, no water dripping off the coach and you can tell which one us running by looking at the tube.
Thanks, guess my units are different. The pans are slightly above roof level, so drain tubing is on the roof, and joins the units, then drops down over the engine compartment and dumps under engine radiator. When camping, I put the dogs water dish under it, keeps it full of cool water.
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Old 03-21-2019, 10:17 AM   #11
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I had to replace mine on the front unit several years ago. The motor bronze bearings froze up.



I clean out my lines by using a wet/dry vac on the tubes behind the cap, after removing the bug shield.


Due to a design flaw, IMHO, these pumps run whenever the compressor runs, cool and heat mode (at least on my units). Verified by emails to Winny and Airxcel.


These are small pancake motors and pump similar to ones used in evap coolers, just smaller. I think my replacement was about $60.
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