Short cycling water pump, only in 1 faucet

[PAL_1962]

Hi, just picked up a 2013 Eagle Premier. Going thru the steps to get it ready for our first outing. While sanitizing the fresh water system, all faucets cause the pump to cycle normally, except the bathroom sink faucet. It causes the pump to cycly really quickly while wide open. I cleaned the aereator, but still have the same issue. Any ideas?

Thanks

 

[lynnmor]

Sounds like it has just the right flow rate to cause the cycling.  Test it with the aerator removed.  Also, you may have lost the air pocket in the water heater.

 

[Gary RV_Wizard]

Yes, a difference in flow rates. The pump cycles based on maintaining some fixed pressure point, usually about 45 psi.  The faster the flow rate, the more quickly pressure drops and causes the pump to come on. Sometimes a faucet has a rate of flow that is just right to produce annoying pump cycling. Of course, the more the tap is opened, the greater the flow. At some point the pump runs continuously trying to keep up.

It sounds as though your bath faucet at max flow is spewing water at a rate that is just slightly less than what the pump can produce. That causes the pump to reach shut-off psi but switch back on again almost immediately.  Some possible remedies are: (1) Install a pump with a greater or lesser max flow rate (note this affects all faucets one way or the other), (2) adjust the pump pressure shut-off point up or down a bit (but not all pumps are adjustable), (3) switch to a variable flow rate pump (more expensive but nice).

 

[Rene T]

RV faucets usually have a restrictor plate in the aerator and it has a small hole in it to allow water to pass thru. many times, (I've even done it) owners will remove the plate or drill a bigger hole so there is a greater flow. That may be your case with that faucet.

 

[SpencerPJ]

RV faucets usually have a restrictor plate in the aerator and it has a small hole in it to allow water to pass thru. many times, (I've even done it) owners will remove the plate or drill a bigger hole so there is a greater flow. That may be your case with that faucet.

Make sure you put the sink stopper in, it stinks unscrewing the aerator and dropping parts down the drain. 

 

[PAL_1962]

So after much searching, I found the water filter. it looked like it had never been changed. put in a new one, and the cycling stopped. Thanks for all your tips and suggestions

 

[Rene T]

So after much searching, I found the water filter. it looked like it had never been changed. put in a new one, and the cycling stopped. Thanks for all your tips and suggestions

I can't for the life of me understand how the filter would have caused the issue you had. A dirty filter would have slowed the flow down on all the faucets. You only had the issue with the bathroom faucet. Someone help me understand.

 

[grashley]

The filter restricted flow to that "magic" flow rate Gary described.  Based on the fact it was partially plugged proves the need for a filter!

One other "fix" for any system is adding an accumulator tank.  This is a buffer the pump will fill and reduce cycling.  Super easy to install.