HWH Control Panel died.

[mojoman]

Need some diagnostic help. 2005 KSDP 3910. HWH AP33539 hydraulic jack Control Box in front passenger side under the hood. HWH AP31351 Control Panel located to the left of the drivers seat. It had been working fine. Now it’s completely dead ….. no LED’s. I haven’t been able to find much on line that has helped in diagnosing the problem. We have a trip planned next week where I know I’ll need leveling jacks.

Here’s what I’ve verified so far.
Park brake is on. Transmission in neutral. Key is in accessory position. I’ve verified 12v power on the red wire in the harness connected to the Control Panel. I’ve verified 5v. on the output of the voltage regulator on the Control Board. When you plug the harness on the Control Panel there is a small red LED on the back of the Control Panel that flashes once. I’ve checked function of the button switches in the control panel with an ohm meter. Not working on shore power or house batteries. Batteries are fully charged.

Below are pictures of the control panel and LED’s in the control box. The control panel box LED’s are shown with ignition on, ignition off, and accessory position. Ignition on and accessory position LED’s are the same. All LED’s are red except for 2 yellow on the sub panel in the bottom of the control box which are for calibrating level position.

Tech support callback is a 3 week wait.

Questions:
Is there a Control Board schematic available? I could likely repair it if I had that.
Is there a known failure mode on the Control Board besides the button switches?
If nothing is lit on the Control Board is the failure likely there or in the Control Box?

[Skip426]

Pictures not through ( yet )

What series is the HWH system ? 325 ? 625 ?

Have you looked close to the pump motor for a main system inline fuse ?

EDIT : I see you have voltage. Do you have the system manual ?

[Skip426]

E mail Paul Maddox , he works for HWH and helps members with issues .

pfmaddox@att.net

He'll probably get back to you way quicker that the factory.

[mojoman]

It’s a 325.

Yes, there is 12v on the back connector.

[2004Horizon]

Not that I would know where you should look first, but here are some things I learned about my HWH Solenoids and Pump that may help you with your diagnosis:

* I think all these HWH models work on the same principle. The pump spins in one direction, and 1 pump operates both the jacks and the slideout extension rooms.

So this begs a question: Can you get your pump to work by hotwiring it?

Relay's That Switch Power To The Pump

Typically you will have 2 solenoid, but not always. My HWH has 3. Let's just talk about the 2 solenoid system which is more common. (See schematic below.)

* The Master Solenoid is ignition switched and is always receiving house battery power.

* The pump solenoid is switched when you press the jack or room extension button.

==> So the pump spins and the solenoids direct hydraulic pressure where it needs to go. That's most of what this black box does.

NO POWER TROUBLE SHOOTING

I would start by making sure your pump will run.

The positive battery posts are obvious, but the relay small posts are not marked positive or negative. Sometimes the wires are labeled, and white wires are usually negative, but on my relays I had black wires to each small post of the relay. So you can use a lighted power probe to find the hot wires and you can do a continuity check to verify the ground wires.

Also, the HWH pump itself does NOT have a ground wire because the pump gets it's ground though its 5" mounting screws, which can come loose. So, you should verify you don't have loose pump screws -- and for good measure, I would even add a ground wire to one of those mounting screws. Any wire will do, but don't be surprised if you have a hard time finding a good chassis ground in that area.

Once you identify the which small relay post is "+" and "-" (and be sure you are correct) you can add a ground jumper to the negative post. Why?
Well, this ground comes from your switched parking brake circuit, so you want to verify your parking brake switch is giving you a good ground, because if you don't have a ground then your pump will not run. (Alligator clip a ground wire and see if your jacks or slide work when you press the button?)

Next, let's see if you can hotwire the solenoid to get the pump to run?

==> Just alligator clip a jumper wire to the big battery post and then MOMENTARILY touch the other end of the jumper to the small "+" post. If you pump starts then you know you have a good solenoid.

Summary

1) Check fuses and make sure you don't have any plaque build up. I.e., the fuse may not be blown, but if it's got dirty contacts it will limit the current thru the circuit and your solenoid will not work. (This happened to me last month and I spent 2 days scratching my head when all I needed was a new fuse.)

2) Make sure you have good grounds.

3) Make sure your solenoids work.

Note: Sometimes you have to disconnect the wires to verify you you have +12V to the hot wire.

4) Clean that Gray connector to the Input/Output system board. (See diagram below.)

Final note: Your relay solenoid require very little current to "power-on" the solenoid coil. This is why your fuse may not be blown, but a corroded fuse connected or a break in the fuse holder may be your problem.

GENERAL COMMENTS

* Jacks have large solenoid switches that use hydraulic pressure to force the jacks down. Then your jack springs pull the jacks up when all pressure in the system is released.

* Room extension solenoids oppose one another on the HWH manifold. The front facing hydraulic solenoids are to used for extending the rooms, while the rear mounted solenoids are used to retract the room.

[shootist]

Your pictures didn't post

[Ray,IN]

The AP part numbers are somewhat immateral, what you need to do is identify your model leveling system; this will assist in correctly identifying yours.
With the correct model number you can download the electrical schematics and service manual for your leveling system from the HWH website.
The quickest way to download your service manual is using your search engine with the terms, " HWH model xxx service manual".
Some are listed here: https://rvtechlibrary.com/chassis/leveling.php


There are from 5 to 11 fuses on the control box, are they all good?

[2004Horizon]

Shootist: I see the pictures. Please let me know if you can't see them and I will try posting again.

[shootist]

Still no pictures https://www.irv2.com/forums/f115/200...it-612819.html

There is my recent thread on it. The control pads are all the same in the way they work I believe.

[2004Horizon]

HWH pictures reposted:

[mojoman]

I posted several days ago regarding a “dead” HWH Control Panel on our 2005 KSDP. I’ve tried all the suggestions given. It looks like I’m at the point where the Control Panel and Control Box need to be sent into HWH for repair.

Is there a simple way to manually dump the air bags so I can continue using the coach while the HWH is being repaired.

What has been your experience with how long it takes HWH to do the repair and what was the cost?

[shootist]

Originally Posted by 2004Horizon

HWH pictures reposted:

Sorry for the confusion, I meant the op's pictures. He was totally non responsive. Now I see he is just sending his unit off to hwh. Not a bad way to go.

[mojoman]

My apologies. I wasn’t intending to be “totally” unresponsive. I just have a lot of things going on.

[mattyrj]

I just stumbled across this post as i am looking for the control panel for my 325 longboard series. Mine the facing has started cracking, so sometimes when holding down a button to level, it gets stuck and when released it won't release. mojoman, did you have luck sending it into HWH? or finding a replacement? I can work around it at the moment, but want to get it replaced sooner rather than later. It is annoying when it goes out of level because i release the button and it keeps going.