Background: MOT replaced the HWH controller in January of this year along with the right rear level adjuster and solenoid. 1995 U320SE
We are now parked in a spot that needs the rear up by about 6" so when we level the coach it drops in the front then raises the rear. It goes through the motions just fine, all is well until I shut if off. Air light stays on but after about 30 minutes, the right rear has returned to travel height so the coach "lists to starboard". It immediately goes back up when I start the coach but will return to travel height after the key is off for a while.
Any ideas?
Ideas:
1. If you leave the HWH system "ON" ( in auto level mode) the system should check level condition every 30 minutes. If the right rear corner is low (enough to trigger yellow light on panel), the system should attempt to correct this. It should first try to lower the opposite FL corner (but your front end is already full down), then it should try to raise the droopy right rear corner. It will do this using air pressure in your tanks. If system air pressure is low (less than about 80 psi), the HWH aux pump should run.
If any (or all) of this is not happening (sounds like it isn't), then your HWH system needs further attention.
2. Possible causes for the initial right rear corner "droop":
a. Leak in one or both RR air bags
b. Leak in air line going to right rear air bags.
c. Leaking check valve in rear 6-pack manifold.
d. Leaking solenoid valves in rear 6-pack.
Do you drain your air tanks on a regular basis? Do you ever get any water, oil or white stuff out of the drain valves, especially the wet tank valve?
Much valuable info is found here: http://www.hwhcorp.com/ml20635.pdf
Turns out a new travel solenoid was bad, it would leak down to travel position. MOT is replacing it now.
Save the old one if they don't want it. You can rebuild it with one of the plungers and o-rings from the kits from the Newell guy. Something to carry as a spare (because as we all know, if we have a spare the existing one will never go bad)