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Water pump switch. 2008 Diplomat


ScottB

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All 3 switches for the water pump will not turn off.  I have wired an additional switch between the hot line of the pump to enable the pump to be turned off and on as needed.   Could this be a relay issue?.  And if so does anyone know where the relay is located?  The only relay that I can locate in the wet bay is for the Sanicon    
 

thanks   

 

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https://www.rvpartscenter.com/shop-by-categories/list2/electrical-12-volt/ac-to-dc-1/rv-power-converters-3/intellitec-water-pump-controller-00-00145-100-detail

Click here.  There is a DIAGRAM in  the side bar.  CLICK ON IT.

This is FOR A PUMP with a Pressure Switch.  You MAY have the RV55 AquaTech or Remco RV55 Pump.  That PUMP does NOT have a pressure switch on it.

The circuit, in a narrative is like this.

The branch switches are all GROUND (Momentary Contact). When you PUSH a switch in...it sends a GROUND signal to the Controller.  The Controller then is a TOGGLE.  Push a switch...the controller LATCHES IN and the PUMP stays on.  As IN there is VOLTAGE to the PUMP.  BUT the internal pressure switch is what controls the pump coming on.

Push a switch again...that then kills or toggles OFF the Voltage.  REMEMBER...the pump switches are Momentary GROUND.

There is a PUMP ON light that is in parallel with the MOTOR.  So, when the Controller is LATCHED IN as in ON...the same VOLTAGE signal that sends power to the pump also lights up a pilot or INDICATOR light.  Don't know HOW many switches you have....typically FOUR.  Hall Vanity; Private Toilet; Kitchen and Service Bay.  ALL those switches are just GROUND WHEN PUSHED.

You need to locate the PUMP Controller.  Look on the 12 VDC or HOUSE fuse box for a PUMP FUSE.  That will be in Section 8 of your manual.  There is NO RELAY in that circuit.  The ON RELAY is actually built in to the controller.  CHECK that fuse.  That FUSE must work for the Controller to WORK. IF you are NOT getting an INDICATOR light on...anywhere...remember they are all TIED to the same wire...then there is NO POWER going to the Pump.  Find the Controller.  Check the POWER input for 12 VDC.  If it has POWER....which will be coming from the House Fuse box...then the controller is bad.  Order a new one.\

That's it...

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Okay, thank you for the info.    Assuming the built in relay failed, would that send power to all (3) switches and power to the pump without the switches being pushed.    I walked by the coach the a few days ago and heard the pump running, evidently turned on by itself???  None of these will turn off now.   

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58 minutes ago, ScottB said:

Okay, thank you for the info.    Assuming the built in relay failed, would that send power to all (3) switches and power to the pump without the switches being pushed.    I walked by the coach the a few days ago and heard the pump running, evidently turned on by itself???  None of these will turn off now.   

OK..for clarification, the control is a toggling on/off latching relay.  So, technically, the controller is a relay.  It is all one unit.  Relay is part of the PCB and is mounted on it.

Remember….there is NO POWER to ANY SWITCH.  The switches are ALL PUSH DOWN; Momentary CONTACT.  Let off and the switch pops up.  The monetary contact signal….just says.  HEY CONTROLLER….do it again.  So, all the switch or any switch does is just toggle ON and OFF the controller.

That’s how it works.  Look at the circuit….  When the controller is “LATCHED” on…power to the pump and the indicator lights are ON….push a switch again….the relay unlatches and then Latches into the OFF position.

FIRST check fuse.  Second locate controller. Test for voltage on 12 VDC input.  You got power??  ALSO CHECK the GROUND on the controller…to GROUND….  Then use a jumper and give the “INPUT” or signal terminal a quick GROUND signal….no work….order new.

Got it?.

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Tom and Dr4film have you on the right track. I had the same issue last year and I replaced the controller and it fixed it. See photo attached. 

Screenshot_20240610_210544_Gallery.jpg

This is the one I replaced. Found it on Amazon. Check your part number. Mine was located in the wet bay near the water pump.

Cajunboy1959

Screenshot_20240610_211131_Amazon Shopping.jpg

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The controller shown in the picture is located along the wall, behind my water bay panel. We have a 2008 HR so yours may be very similiar. 

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Have not r&r the part yet, waiting in delivery, supposed to be here tomorrow.   I’ll sure let you know when replaced.   
 

Of course  today when I was searching for the controller all the switch lights were out and are operating properly.  Go figure.  Still going to replace at your recommendation and see what happens.  
 

thanks again.   

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Hi Scott B,

Just another thought. A bad or loose ground could have caused your issue. Like many have mentioned the momentary switch has no power to it. In the pushed momentart position it is just grounding out one of the terminals on the controller to latch it on and off with 12volts to the water pump via the load terminal on the controller. I hope this helps.

Cajunboy1959 

 

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@ScottB Hopefully it is a failed controller, otherwise you will have a spare to hang onto in your spare parts box. That controller is a "latching" controller. it is either latched in the ON position or OFF position.

There are only four connections to the controller - Red wire is constant 12 VDC Positive, purple wire is for all of your switches, black wire goes to a high amp relay (explanation below) and white wire goes to constant ground. I would have checked all of those connections making sure they were tight and operated as designed.

You should have a 40 amp relay mounted on the wall too which the black wire from the controller will go to one terminal on that relay. The purpose of this relay is to handle the higher amp heavier gauge wire that your water pump requires to run.

The controller operates as follows - When you engage any of your water pump switches the controller will "latch" ON which sends 12 VDC power through the black wire to the high amp relay which closes and turns on your water pump. As long as your water pump is on with ALL of the indicator switch lights lit up, the water pump will be "active" and turn on and off when any  water is used via the pumps internal pressure switch. When you use any switch to turn OFF the water pump, the controller "latches" OFF which then turns ALL of the switch lights OFF. The water pump no longer has any power to run.

 

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You likely exercised the connections on the controller when you found  it and probably did a tug and tickle. 

It is incredibly hard to resist and find myself doing it. A meter gently measuring before wiggling can give you confidence in  a repair that can drive you crazy if it is an intermittent. 

 I keep my positive leads sharpened to allow contact with less pressure. 

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