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Old 06-02-2016, 08:47 AM   #1
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Narrowing in on chronic issue - water pump

I've had my 2016 27RLS trailer in to the dealer 3 times for this issue and it persists - very aggrivating. This last time they replaced the water pump completely. Every time I think we have it licked it comes back.

The water pump will cycle for 1/2 second every 5-10 minutes or so.

Here are the facts of some analysis:

1. Dealer reports no leaks in system (not sure if I trust that). Although I've never seen a leak anywhere (ground etc).

2. Water pressure on pump is fine.

3. Happens more when outside temp < 50 or so. This make issue tricky because it doesn't happen in warmer Phoenix weather at dealer. Contraction issue? We get to campsite where it's 75, coming from Phx where it's 95 now and it doesn't happen all first afternoon. Night temps hit 45-55 and it starts.

4. Water heater can be on or off it doesn't affect issue. Still happens.

5. Water pump is brand new

I'd appreciate some guidance for further analysis.

Thank you in advance!!
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Old 06-02-2016, 09:22 AM   #2
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Check your valve in the toilet to make sure it's closing. Something is allowing the pressure to bleed off triggering the pump.


My current rig will do the same but it's about every three or for hours and it just blips on for a very short duration. I have no evidence of a leak either and never really thought much of it. My suspicion has always been that when the pump is not working pressure is slowly bled off back through the pump into the water tank. I've considered it normal behavior and never thought much of it as our habit is too turn the pump off when it's not being used anyway (Old habit from grandma when we were kids).
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Old 06-02-2016, 09:31 AM   #3
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Thanks Rusty - How do you check the valve in the toilet? Ours just has the foot lever on the side.
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Old 06-02-2016, 09:32 AM   #4
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I agree with Rustysocket the pressure is bleeding back to the water tank. To test it, pressurize the system and then pitch off the water line from the tank to the pump. A small C-clamp or vice grips will do the trick and won't harm the hose.
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Old 06-02-2016, 09:38 AM   #5
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Quote:
Originally Posted by dangerdave View Post
Thanks Rusty - How do you check the valve in the toilet? Ours just has the foot lever on the side.
I was just thinking out loud of places where it could leak that wouldn't drip on the floor. I guess I would dry the bowl real well and just look to see if water accumulates on the flapper.
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Old 06-02-2016, 09:53 AM   #6
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rgchak - Yes good suggestions but after 3 trips (and my losing my cool with the dealer) I would have to think they did all that? who knows


NOTE:
I just now went in and studied the toilet. We have a full size toilet, and the ring of water outlet holes around the top inside of the bowl is ever so slightly "weeping" little occasional drips of water down into the bowl. You see a bit of water well up in the hole, then ebb back, then put a drip down.


My wife likes it cool at night, so I usually kick the heater on in the morning. That could explain the temperature relationship to the issue.

Thoughts?
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Old 06-02-2016, 10:14 AM   #7
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Regarding the dealer, if they replaced the pump with new it's likely within the design spec of the pump.


Clamp off your toilet line, or lift up on the lever to see if it seals the valve better. Sounds like you may have found the issue.
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Old 06-02-2016, 10:15 AM   #8
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Get yourself an "accumulator" (Google RV Water Accumulator). Less than $50, very easy to install, and greatly limits how often the water pump cycles.
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Old 06-02-2016, 11:17 AM   #9
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My water pump will also cycle for 1/2 second every couple hours. I too have no signs of a leak. I started to assume it was the hot water heater bleeding off pressure periodically.

If you figure it out let us know. We might have the same issue, if it's even an issue.
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Old 06-02-2016, 12:44 PM   #10
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Clubhouse - I've definitely been told it's a problem. It's not a show stopper, and almost not worth the hassle of taking it to the dealer for them to(not) fix it.

It does wear the battery down though if you leave it on at night and it starts cycling
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