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Old 06-21-2005, 02:11 PM   #1
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Thumbs up Water pump cycling every 1-2 sec??

Hi gang – we used the water pump in our new 2004 Safari last week for the first time and noticed that it is cycling on and off about every 2 – 3 seconds! Seems excessive to me. I know there is no accumulator in the line to balance out the pulsing water pressure. Is there some adjustment on the pump itself? At this rate, the thing will bite the dust within a year. Or is this normal?

The water tank is full. We are not hooked up to city water. What gives? I will be taking it back to my dealer because I think this should be a warrantee repair but he’s new in the game and I’d like to give him a few ‘hints’ about what might be wrong.

Any ideas??
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Old 06-21-2005, 02:17 PM   #2
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Well, I think that there is a check valve which might not be working correctly and or there is a leak some place. Ours also cycles when not in use, but prob only 1 time every few hours if not longer....every 2-3 seconds though clearly is far too much. Have you checked the water heater and made sure that everything is properly closed? Does it cycle this way with the water heater by-pass on and off? Also, you can access the pump, see the tank and check valve from those little square doors under the streetside pantry and closet doors. I'd open those doors up (they are on hinges too, just no handles) and shine some light in there to see what's going on...you might see the issue right out of the gate since outside of the water lines around the coach, the main action happens right in that area.

Any way you look at it, I would think it's a warranty repair if it's still under warranty.
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Old 06-21-2005, 02:25 PM   #3
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Same thing happened to me once on my '04 CCD. There's a screw on the end of my water pump that adjusts the outgoing water pressure setting. A/S HQ told me to adjust it, which I did, to correct the problem, which it did.

Might be "no big deal".
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Old 06-21-2005, 02:46 PM   #4
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Sounds like a leak somewhere.
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Old 06-21-2005, 05:36 PM   #5
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Yeah, a leak. If the system used to work normally it is unlikely the pump sensitivity changed itself in the meantime.

The check valve/water inlet may be where the leak is. That part of the system gave out on me a few years ago leading to the symptoms reported. It was easy to find because it sprayed water when the pump was on and dripped down when the pump was off.
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Old 06-21-2005, 05:41 PM   #6
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Mine changed and there was no leak... I talked to both A/S and Shurflo - same story. I reset the adjustment and it was fine.

I'd try that first...
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Old 06-21-2005, 06:03 PM   #7
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There could also be an Aquajet pump installed if you have the LS package.
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Old 06-22-2005, 09:43 AM   #8
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Great suggestions, gang!!! I HOPE HOPE HOPE it's not leaking somewhere. I've looked under the cabinet at the pump and there appears to be no water under there. I didn't realize there would have to be a check valve on the supply side of the pump but it makes sense that the pump would need something to keep the pressure from bleeding back into the fresh water tank. The pump never cycles by itself - only when a faucet is opened. Then it goes into speedy mode, cycling every couple of seconds. That may rule out a leak or a failing check valve. I will look for the pressure adjustment first. That sounds like the simplest approach. Thanks again.
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Old 06-22-2005, 10:07 AM   #9
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Rivet Normal operation ?

Quote:
Originally Posted by BOBHAST
The pump never cycles by itself - only when a faucet is opened. Then it goes into speedy mode, cycling every couple of seconds.

That sure sounds to me like proper operation for the pump or do I not understand your observations.

The pump, if operating and installed properly, should create pressure and stop running - once it reaches the pressure level calibrated to the pressure switch. If you don't open any valves (or there are no leaks) the pump should not cycle again for an extended period of time.

When a valve is opened the pump (if providing adequate line pressure) will activate, cycle on and off while the water is flowing, and continue to operate after the valve is shut until the pressure sensitivity is reached. Then it will stop.

If there is air in the lines, or somewhere air is being pulled into the lines (like a gasket on the in-line filter) then the pump will run faster than it would normally, although when the valve is closed - air or not - the pump should stop and remain stopped.

When I replaced my 20 year old pump in the '85 with a SureFlo, I can pressuriize the system, turn the pump off, return days later ... turn the pump on again and it will not cycle. My system will maintain pressure for days, even weeks it if I allow it.

Any time a pressure pump cycles it is because the line pressure has fallen below the sensitivity level of the pressure switch. Sometimes the pressure switches go bad & sometimes the 'check valve' can weep, but a totally solid system will hold the pressure placed into it for an extended period of time.

This stands true, as long as you have adequate water in the tank!
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Old 06-22-2005, 10:07 AM   #10
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Mine acted the same way - no pump cycling until a faucet was opened.

The adjustement screw fixed it.

Let us know what you discover. Good luck!
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Old 06-22-2005, 10:49 AM   #11
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Xray is correct, if this is an Aquajet pump the adjustment screw on the back will back off the pressure so that it does not pulse so heavily.

It is a hex (Allen type) key, but I do not remember the size.

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Old 06-22-2005, 02:44 PM   #12
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On our last trip out, our water pump seemed to go crazy when we took showers. The sound was awful, and I could actually hear the sound of PEX tubing rattling against the shell of our unit. It was a rat-a-tat-rat-atat sound.
It was almost a real exagerated house-hold-water-hammer type sound.

Here is what I found: Shower spray on, pump would cycle normally for 10 seconds, and then suddenly go into "rat-a-tat-rat-atat" mode. If I shut the sprayer off (even for one second) using the on/sorta-off switch on the spray head, and then turned it back on, the pump would run fine again for 10 seconds or so, and then go into "rat-a-tat-rat-atat" mode again.

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Old 06-22-2005, 04:03 PM   #13
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My bad....my take too was that this was when no faucets were open. If there is such a beast to adjust, then I agree, I'd look there.
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Old 06-22-2005, 07:22 PM   #14
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Quote:
Originally Posted by crazylev
Shower spray on, pump would cycle normally for 10 seconds, and then suddenly go into "rat-a-tat-rat-atat" mode.
Check your plumbing lines to make sure they are securely attached. I also had the "rat-a-tat" noise but was able to silence it once I secured the lines.
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