[Richard]

David at the risk of repeating what the other guys have said. A wee bit of understanding may help you figure this out.

All air going to the air bag travels through the HWH six pack solenoid valves.

If you are in travel mode, the air coming from the height control valve goes through the six pack travel solenoid and then to the air bag. That solenoid (pathway) is only open when the HWH panel is in travel and the key is on.

There are two level modes. One is manual and one is automatic. Say what? If you push the level button once, the system is in automatic level. It will respond to other button pushes from you on the HWH console. If you push the level button twice, the system goes into automatic mode and uses a level sensor in the middle of the coach. It will let air out or put air in the air bags to level the coach. It does this by opening either the lower or raise solenoids in the HWH six pack. Unless you turn the system off, once it is in AUTO it will wake up every thirty minutes and try to relevel the coach. Turning the ignition key off does not disable the AUTO level mode.

I don't use the autolevel mode because mine would occasionally lose it's mind, and pancake the front of the coach to the ground.

Key takeaways are that the airbags are completely isolated from the rest of the air system UNLESS one of the six pack solenoids are activated. Travel mode on and key on activate the travel solenoids. Level on and input from the panel activate the solenoids. Otherwise there is no intended air in or out of the bags. It does not matter if your compressor is running or not since the solenoids are closed.

I hope this helps.

So to test the leak properly, the coach should be off , and the leveling system should be OFF.