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Old 09-02-2015, 09:47 AM   #11
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If there's "to much" head space in the wh the pump will run like you say.

How do you bleed the air from the wh?

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Old 09-02-2015, 12:22 PM   #12
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Water Pump Cycles When No Water Demand

I had a similar problem with my Hybrid Trailer. Sometimes the check valve for the city water is not sealing off properly. What I have done because it was all I had is screw in a "Y" valve with shutoffs. That solved it until I can reset the check valve. This can be done sometimes by just hooking up to city water. Another time my low point valve was dripping slightly. Fixed that and all has been good. I hope one of these works for you.

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Old 09-02-2015, 01:03 PM   #13
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Water Pump Check Valve Leak

The check valve on the water pump had a small piece of debris in it so the fresh water tank filled up over the course of ten days when the city water was hooked up to the coach in our new FR3 30 DS.
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Old 09-02-2015, 02:45 PM   #14
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Originally Posted by MMulcahy View Post
My water pump cycles intermittently when no water is being used. It is not frequent and i have been assuming that it is just maintaining pressure, but i read somewhere today that it should not cycle at all if no water is being used. Should I be concerned that I have a water leak?

Thank you
Our water pump cycles now and then due to changes in water heater temperature, e.g. when it's off at night and hot water cools down thus losing pressure. I also found that the pop-off valve on the water heater leaked now and then causing the pump to run. I replaced the pop-off valve and solved that problem.

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Old 09-02-2015, 02:48 PM   #15
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You have a leak somewhere.

Look around for small water puddles, all the plumbing and around the water heater.

You could also have a pump that is leaking internally (pressure side leaking back to the suction side) but these are rare.
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Old 09-02-2015, 04:24 PM   #16
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I am on my 5th camper and in every one of them the pump has run for a second or so a couple or so times a day. I would say that this is normal. Of course if this happens a lot you should check for leaks.
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Old 09-02-2015, 08:13 PM   #17
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There is a demand. Unless it is the ice maker. Oh wait that is a demand.
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Old 09-03-2015, 12:11 AM   #18
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I chased this problem off and on for a few years in my previous trailer. It would cycle for a while then it was of for a few trips, then it would cycle again. I finally discovered that the city water check valve would not seal sometimes. I replaced it and the problem went away for good

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pump, water, water pump

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