We just got back from a trip and everything on the Aux. Compressor and Leveling worked fine.
Parked the Coach in the garage, set on Auto-Level and after a couple of days, when the Aux. Compressor started, once it got up to pressure, it would not shut off. It would just cycle on-off-on-off-on-off-on and continue until I manually shut it off.
I assumed it was the pressure switch and ordered this one:
Square D by Schneider Electric 9013FHG2J27 Air-Compressor Pressure Switch,... (https://www.amazon.com/dp/B000CCJ6QK?psc=1&ref=ppx_yo2ov_dt_b_product_details)
I replaced it (that's the new one installed in the picture without the cover. but still have the same problem.
Also, when working on it, I saw that the wire with the tape labeled Aux. Comp. Solenoid was just rolled up and tie wrapped without connecting to anything. What is this for? (Red Arrow) I thought that was where the air line that controls the slide bladder connected to but wasn't sure.
The system has been working fine for years as wired until this problem popped up.
Is there any other piece that would make the compressor shut off once it achieved pressure ? I am stumped.
There should be a check valve.
If you haven't changed it yet, it might have rust inside preventing the o-ring from seating.
Cheap part.
Try the compressor manufacturers' website for a wiring schematic.
So the red wire I believe commands the compressor on when leveling. Any time you push a manual valve it raises and runs.
So you have a leak somewhere.
I would turn the HWH shut off valve to the slide and air awning to isolate. If it shuts compressor off you know your compressor is correct. Then one at a time add systems back in till you have a resolution. Also isolate your leveling to see if it has leaks. Your arrow is pointing to the compressor tank solenoid which isolate the tank during level commands
Scott
Scott,
Is there a reason that the wire with the tape label on it isn't going to anything? Of the two wires coming out of that solenoid, one goes to a ground screw and the one with the label was just tie wrapped in a bundle.
I'm leaning toward replacing the power relay that controls the compressor. Is it possible that it could be stuck? It almost seems like the pressure switch is working properly and sending signal to that relay, but the relay isn't reacting, thus the pressure switch just keeps opening and closing continually.
Everything else seem okay.
Would anyone happen to have a part number for the power relay that controls the Aux. Compressor ?
I think I need to better describe the issue. It's not that the pressure is leaking down and the compressor runs to build pressure, then stops, looses pressure and starts up again, then keeps repeating.
It runs, builds pressure in the tank, then when gets to the shut off pressure, the pressure switch reacts, but the pressure switch contacts just keep opening and closing and the compressor keeps running. The tank maintains pressure, it is not leaking down.
That's where I thought maybe the pressure switch sent a signal to the compressor relay/solenoid to shut down, but maybe it is stuck.
Hope that describes my problem better.
I just bought this one from Ebay. Same part number as the relay that was in my coach and was bad.
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If the link doesn't work, search for: White Rodgers Solenoid For 12V Universal 120-105111-5