Pump Switch

Topic: Pump Switch (Read 2807 times) previous topic - next topic

Pump Switch

June 24, 2019, 09:27:24 pm

I just got done installing cork flooring in the coach bedroom. Looks good. Then I washed her up and got ready to bring her to a big barn where we keep it during our stay here on the lake in Maine. Before I left for the storage site, I ran the Aqua Hot and generator. Then I hit the pump switch to cause " demand " for hot water. NO LIGHT!!?

at kitchen sink switch.. Went to bath. NO LIGHT on that switch either. Went outside to wet bay. NO LIGHT on switch ??!! I DID NOT check fuse. Is there a dedicated fuse for the pump?. I did NOTHING to the water system during the floor install. How do these things " just happen"

? Any suggestions would be welcome.

Re: Pump Switch

Reply #1 – June 24, 2019, 09:45:11 pm

This sounds like a set up to a punch line.. cork floor and no water?

Re: Pump Switch

Reply #2 – June 24, 2019, 09:50:00 pm

Check your latching relay.
John M.

Re: Pump Switch

Reply #3 – June 24, 2019, 09:56:26 pm

Quote

Check your latching relay.

Here's what the latching relays look like if yours are original. They are behind that flat white fiberglass cover in the big compartment. Lots of threads on replacement.
jor

Re: Pump Switch

Reply #4 – June 24, 2019, 09:58:45 pm

Latching relay?? Which is it in that picture?? Where do I get one?
Thanks, all

Re: Pump Switch

Reply #5 – June 24, 2019, 10:02:19 pm

My water pump has an inline fuse at the pump. Probably not factory, but have a look as the instructions on the new pumps want one at the pump.

Re: Pump Switch

Reply #6 – June 24, 2019, 10:16:33 pm

intellitec. 00-00189-000 I got mine off Ebay for 45.00 but I don't see any with that part number. Someone else may be able to tell you if it crosses over to a new number
Chris
Glenn you might google it I found this one PDXRV warehouse 78.68

Re: Pump Switch

Reply #7 – June 24, 2019, 10:25:36 pm

Glenn,

The water pump circuit breaker is behind the white panel on the driver's side front wall of the main bay. The latching relays are on the lower right area behind the panel. They are white, not like the picture above. The latching relay provides power to,the pump and the indicator lights. The momentary switches close a ground path that causes the relay to latch or release.

Roger

Re: Pump Switch

Reply #8 – June 24, 2019, 11:09:24 pm

Our water pump latching relay is on the electrical panel with the isolator, etc on it. Foretravel used a VW headlight latching relay on many coaches but not sure if it's the same on yours. Here is the VW part it's also available for much less with a different part number and from an Asian supplier. vw headlight relay latching - Google Search

Here is the schematic for our U300 showing the water pump relay on the top of the schematic on the right side. https://www.foreforums.com/index.php?action=media;sa=album;in=194;nw;start=35

From there, you have to go to schematic B-2126 to see where the relay/water pump gets it's power from. If I can find it tomorrow, I will send it. As I remember, it's from the same electrical panel it's mounted on and is CB protected. Again, this may not be the same for your coach.

Pierce

Re: Pump Switch

Reply #9 – June 24, 2019, 11:14:55 pm

Here is the part VW Headlight Dimmer Relay for 12 Volt Cars (5 Prongs): VW Parts | JBugs.com . Not a OEM Bosch part at this price.

Check for 12V at the relay before ordering one.

Pierce

Re: Pump Switch

Reply #10 – June 24, 2019, 11:34:38 pm

Quote

They are white, not like the picture above.

The photo shows the stock latching relays on our 99 320. When they went bad I replaced them with ones that looked quite different and were white in color. Foretravel probably switched to the white ones after 99. Here's a photo of my replacement and a link. You can also get them from Foretravel or use one of the other suggestions. Relay
jor

Re: Pump Switch

Reply #11 – June 25, 2019, 12:51:38 am

John,
Is this a picture form one of your previous coaches? Our 99' U270 had just one of these latching relays on that breaker panel for the water pump. It has a second one of the same relays for the light that is switched over the kitchen sink and by the door.
Don

Quote from: jor – June 24, 2019, 09:56:26 pm

Here's what the latching relays look like if yours are original. They are behind that flat white fiberglass cover in the big compartment. Lots of threads on replacement.
jor

Re: Pump Switch

Reply #12 – June 25, 2019, 08:52:42 am

Glenn

Here are pictures of the relay on my 99 U320. Hope this helps

Mike

Re: Pump Switch

Reply #13 – June 25, 2019, 12:06:33 pm

For a 2001, U320
The White Panel
Water Pump CB and Latching Relays
Latching Relays. Finder type 20.21, NO, 12v coil

The button on the relay latches or releases the relay.

Not all coaches are the same.

Re: Pump Switch

Reply #14 – June 25, 2019, 12:43:03 pm

Thanks, everyone
I would like to test the relay to see if it is getting power. All the above pictures show wiring a little different. Some have white wires coming into the top with green below, some have red......
How do I check for 12 v? Will I be able to just switch out the existing wires into a new unit?
I see A1 and A2, but don't know what that means
Electrical is not my strong point, but want to learn from y'all
Thanks

Re: Pump Switch

Reply #15 – June 25, 2019, 01:12:12 pm

Quote from: GleamB – June 25, 2019, 12:43:03 pm

Thanks, everyone
I would like to test the relay to see if it is getting power. All the above pictures show wiring a little different. Some have white wires coming into the top with green below, some have red......
How do I check for 12 v? Will I be able to just switch out the existing wires into a new unit?
I see A1 and A2, but don't know what that means
Electrical is not my strong point, but want to learn from y'all
Thanks

You need a volt meter or at least a 12 volt test light. If you don't show any voltage on any of the wires going into the relay, you need to address that issue first.

Re: Pump Switch

Reply #16 – June 25, 2019, 01:33:04 pm

Why would there need to be 2 of the latching relays for the water pump, is there a practical limit to the number of momentary switches that can be used for one latching relay? I know there are two switches for the central light fixture in our coach, but I haven't looked closely at how they are wired.
Don

Quote from: Roger & Susan in Home2 – June 25, 2019, 12:06:33 pm

For a 2001, U320
The White Panel
Water Pump CB and Latching Relays
Latching Relays. Finder type 20.21, NO, 12v coil

The button on the relay latches or releases the relay.

Not all coaches are the same.

Re: Pump Switch

Reply #17 – June 25, 2019, 01:49:23 pm

what color wire is the "hot" side? White or Green or red??

Re: Pump Switch

Reply #18 – June 25, 2019, 02:14:50 pm

Don,

One for the three places where you can turn on/off power to the water pump and one for the two places where you can open/close the fill valve solenoid.

White B29 provides power to the relay.
Switches momentarily short to ground causing the relay to latch or release.

The fill valve and the water pump are wired the same, power goes to different devices.

Glenn, In your coach B29 goes into 1 and A1. The ground loop comes out of A2. Latched power (white) comes out of 2 and feeds the pump and the indicator lamps.

These drawings (as are most FT drawings) are specific to a range of build numbers.

Re: Pump Switch

Reply #19 – June 25, 2019, 09:52:20 pm

Quote

Is this a picture form one of your previous coaches?

Yea. It's our 99 320. Like Roger said, it had two. One for the pump and one for the fill. One of mine failed so I replaced both with the white Finder deal.
jor

Re: Pump Switch

Reply #20 – July 02, 2019, 07:16:35 pm

I went to the coach today. Wasn't sure how to check the latch relay to see if it's getting 12v. Pressed the reset switches....they clicked but didn't stay "in"?

Still three dead switches. I am not sure which is to pump and which ti fill. Also not sure how to remove from the board. There seems to be two silver posts. Are they pressed onto the posts. Where should I get replacements.? The BEST place.??
Is it normal for the switches to work fine one day and then just " die"??

Re: Pump Switch

Reply #21 – July 02, 2019, 07:47:38 pm

Quote from: GleamB – July 02, 2019, 07:16:35 pm

I went to the coach today. Wasn't sure how to check the latch relay to see if it's getting 12v. Pressed the reset switches....they clicked but didn't stay "in"?
Still three dead switches. I am not sure which is to pump and which ti fill. Also not sure how to remove from the board. There seems to be two silver posts. Are they pressed onto the posts. Where should I get replacements.? The BEST place.??
Is it normal for the switches to work fine one day and then just " die"??

If the reset pops back out it is either bad or you have a short. Wish I could help you tell the difference.

Re: Pump Switch

Reply #22 – July 02, 2019, 07:59:39 pm

If he is referring to the button on the relay it is not a reset button, it latches or unlatches the relay.

Glenn, the white wire labeled B29 powers both relays and connects to the A1 and 1 terminals. The grounding switch circuits connect to terminal A2. Terminal 2 connects to white wire labeled C8. On the other relay terminal 2 connects to white wire labeled C28.

There is a button on the top of the relay (on your coach the top of the relay it oriented down) works just like pressing one of the switches. Press it, the latch latches or releases. If you have power at terminal 1 and the latch is latched you will have power at terminal 2. If you short terminal A2 to ground the latch will latch or release.

The 15 amp circuit breaker for the relay power (White B29) is the bottom one on the right column on the left side of the panel behind the white cover.

Start there. Do you have power here? Do you have power at the relays? Does the button on the relay make something happen? Do you have power at terminal 2? If you ground (momentarily) A2 what happens?

It is very unlikely that the latching relay has failed. It is even more unlikely that all switches failed at the same time. The most likely thing is that somewhere the ground circuit is open.

FINDER - 20.21.9.012.0000 - RELAY, SPST-NO, 400VAC, 16A | eBay

Re: Pump Switch

Reply #23 – July 02, 2019, 08:42:02 pm

thanks, again. I will give it another go in a few days. Always something new to learn.

Re: Pump Switch

Reply #24 – July 02, 2019, 08:55:44 pm

Glenn,

The ground wire on the pump itself was causing an intermittent stoppage on ours. I moved the ground to the compartment light switch in the front where I could see it and the problem was solved. I just put a spice on it to extend it a few inches.

Put a test light on the hot wire to the pump and see if it comes on with the switches. Latching relay makes a little clicking noise when switched on/off.

This was in Bill's "hanger" in Texas. Thanks again.

Pierce

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