HWH 325 leveling jacks manual problem

For those interested I found some good information here:








http://www.irv2.com/forums/f101/problem-removing-hwh-solenoid-72695.html

Bounder Lew wrote:
Do the solenoids screw out of the manifold?

Yes. Doug

Do the solenoids screw out of the manifold?

Thanks Chuck: I assume you just screw the solenoids out of the manifold? Of course with the jack up and the power off.

Bounder Lew wrote:
Thank you very much Doug. I think you have pointed us in the right direction and indeed your statement that you should not leave the system on for more than 10- 15 mins and our experience at the heat in the solenoid (the one that completely failed has indications of extreme heat as the paint has pealed on it) is clear evidence of leaving it on too long.
The situation which prompted him to leave it on too long was the fact that once the solenoid failed completely the jacks down light stayed on continuously on that jack- so he disconnected the horn and left it on to see if the jack down light would go out.
And that brings up another question. Why is the jacks down light still on with the fuse blown and the Jack fully up? There are wires to the top of the jack which I assume go to a micro switch. Is it possible that the micro switch has failed?
Thanks again for your help.

Turn on the Dash Touch panel. That will indicate WHICH jack down light is on. Go to that jack and disconnect the down sensor at the sensor multiplug. That will turn the light OFF. If this works replace the sensor IF the jack is fully retracted. If NOT, then the wire harness is shorted somewhere between the jack and the control board. Doug

The wires on the top of the jacks goes to a magnetic switch, the jacks get down about 1/2 inch and they go on. More then likely the solenoids are not staying open so the springs can lift the jacks completely. Try opening the small nut between the wires on the solenoid with a 1/4 inch socket. do not turn it more then about 3 full turns though. That should let the springs return the jack fully, and turn off light. The solenoids are easy to change but expensive to buy, about $180 each from HWH. If the jacks don't go up with just the springs you can try prying them up with a two by four while you have the valve open. Besure to close valve when they are retracted to keep them up. Good luck

Chuck

Thank you very much Doug. I think you have pointed us in the right direction and indeed your statement that you should not leave the system on for more than 10- 15 mins and our experience at the heat in the solenoid (the one that completely failed has indications of extreme heat as the paint has pealed on it) is clear evidence of leaving it on too long.
The situation which prompted him to leave it on too long was the fact that once the solenoid failed completely the jacks down light stayed on continuously on that jack- so he disconnected the horn and left it on to see if the jack down light would go out.
And that brings up another question. Why is the jacks down light still on with the fuse blown and the Jack fully up? There are wires to the top of the jack which I assume go to a micro switch. Is it possible that the micro switch has failed?
Thanks again for your help.

The solenoids are the culprit. They are shorting out. The solenoids are NOT continous duty solenoids. IF they stay on longer than 10 to 15 minutes, they overheat and short out internally. The fact that the other solenoids get hot point to that at some time the system was left ON in retract for more than 15 minutes. That will happen when one or more jacks do NOT fully retract and the system will stay on until the jack is retracted or you shut the system off. You really need to replace all 4 solenoids. The ones that get hot but function will fail in the future. THAT is why the fuse blows---it PROTECTS the Main control board system. Doug