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Old 07-22-2021, 10:25 PM   #1
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Water pump running

2015 Thor Vegas 24.1. My water pump will give a short .5 second burst every minute or so. There is nothing turned on in the MH.. No leaks. Is there something about the the water pump in that it can bleed back into the water tank and need to start up to make pressure? I ask because a couple times now, I’ve had the water tank fill up when hooked to city water.
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Old 07-23-2021, 05:02 AM   #2
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Sounds like a leaky check valve allowing backflow through the pump into the storage tank when hooked to city water and just a general loss of pressure when using the pump causing it to cycle to keep pressure up.

Could be a bad seal or simply a small piece of "stuff" (grain of sand, etc...) caught up in it.

Check the manual for your water pump and see what is serviceable.

I would also check for any leaks/wet spots on the plumbing behing the face of your wet bay. It is possible to have a drip that won't show itself as a very small leak until the whole inside of the wet bay is saturated.

Good luck! I know it's frustrating to hear that pump cycle when you know you're not running any water.
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Old 07-23-2021, 07:55 AM   #3
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Thanks Vach. Yes, its unnerving to hear the water pump kicking in and out like that. On my 24.1, the pump and water tank are inside under one of the beds. It’s pretty easy to look for water leaks in that area. Been keeping a close eye on the other routes the water takes.. no wet areas yet..
So, what you are saying is the same check valve that when failing, can allow the water tank to fill when hooked to shore water can also cause the water pump to “cycle” when using water pump..
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Old 07-23-2021, 09:26 AM   #4
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Quote:
Originally Posted by Indytraveler View Post
Thanks Vach. Yes, its unnerving to hear the water pump kicking in and out like that. On my 24.1, the pump and water tank are inside under one of the beds. It’s pretty easy to look for water leaks in that area. Been keeping a close eye on the other routes the water takes.. no wet areas yet..
So, what you are saying is the same check valve that when failing, can allow the water tank to fill when hooked to shore water can also cause the water pump to “cycle” when using water pump..
Yes.


The check valve prevents water from passing through the pump from the outlet side. When on city water, the outlet side is pressurized by the city water feed, and a bad valve will allow water to be pushed back, through the pump, into the fresh tank due to the water pressure.


When on pump only, the pump pressurizes the outlet lines to the faucets. Once the pump shuts down, the check valve holds that pressure in the lines. If the valve is bad, the pressurized water seeps back through the pump, gradually lowering the pressure in the lines until the pressure switch kicks in and causes the pump to run in an attempt to keep the pressure up to spec.
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Old 07-23-2021, 10:24 AM   #5
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Shut it off when your not using it or until you find the cause. I've had multiple issues with my pump, finally replaced it.
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Old 07-23-2021, 10:38 AM   #6
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Pump short cycling is definitive symptom of a 'Leak'
*Pump internal check valve...possible
*City Water Inlet check valve...check if dripping with pump ON
*Fill Valve leaking thru----system pressure drops/pump cycles
*Water Heater T&P Relief Valve...check if dripping
**Small leaks are tough to locate....lay/wrap pieces of toilet paper around fittings/connections etc
Check an hour later ---damp/leak
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Old 08-13-2021, 07:47 AM   #7
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One possible leak not mentioned is the toilet fill valve. They do go bad, and the leak will be inside the toilet bowl so might not be noticed. We had the same symptom you described (short pump run every minute or so) and could find no leaks anywhere, but we noticed that the toilet seemed to have more water in the bowl than usual. Changed the flush valve and problem solved.
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