Re: HWH issues
Reply #7 –
Expanding on what Dennis and Michelle said (above), the HWH system has a simple set of "rules" it follows during auto-level operation. Basically, if it senses an "out of level" condition it will initially try to correct by releasing air from some of the air bags. If this maneuver is unsuccessful, then it will try adding air to some of the air bags. It will try to use air pressure in the air tanks for this purpose. If system pressure is insufficient, then the HWH aux air compressor will run. If the coach is out of level, and the system calls for the aux compressor to run, but the compressor does not respond, then the "Excess Slope" light should illuminate and the system will basically give up trying to achieve level.
You can do a simple test to see if the HWH aux compressor is operational. With the big engine off, reduce the air system pressure to below about 60 psi. You can do this by either letting it leak down by itself, or by releasing air pressure through the tank drain valves. With the air system pressure below 60 psi, big engine off, and ignition key off, push the "AIR" button on the HWH panel one time to turn the system on. With the system on, press any "UP" arrow (or the "RAISE" button) and the aux compressor should come on. With everything off in the coach, you should be able to hear the aux compressor running. If not, have someone open the bay door and listen.
If the aux compressor DOES run, then there's nothing wrong with the air compressor, and the problem lies elsewhere.
If the aux compressor does NOT run, then the problem is a bad compressor or something in the circuit that supplies power to the compressor motor. This could be a bad wire, bad wiring connector, bad pressure switch, etc.
Link to the HWH Air Leveling Systems Text Book: https://www.hwhcorp.com/ml20635.pdf
Topic: HWH issues (1998)