Coach info in my Signature.
My coach has not been moved since the end of March (Damn Covid) but it was on shore power to keep the batts up and I did start the genny every other month and ran it for an hour loaded. When I parked it in March I lowered the jacks until they took a little of the weight off the tires and then I manually dumped the air suspension, knowing that eventually all the air was going to leak out anyway. So at that point the coach was sitting high because I manually dropped the jacks while aired up. It sat like that since March. a couple weeks ago I started the coach and the coach aired up and the dryer purged as expected. I ran it for a while but was only able to get the temps up to maybe 100.
I needed to take the coach for a ride. I still had the jacks down so I manually dumped the air again, so I could control the speed the coach lowered. Once the air was out I cleaned the jacks and stored them. Now was the time to take the coach out for a run to get everything moving and fluid temps up to normal. I started the coach and this time the coach would not air up
Eventually I used my shop air compressor and pumped up the coach using the front air connection by the Genny. The rear aired up but the front was not. I went to where I ran the cables from the moisture ejectors and pulled on them to let air and moisture out of the two front tanks. I started airing the coach up manually again and this time the front came up. Now I could get under the coach to check stuff (so far I have not been under the coach with this problem). With it aired down, no way could I get anything 'cept my arm and shoulder under the coach. It sat aired up for about the past 12 days without any intervention. So the coach is aired up but the coach running didn't do the airing up.
A little side track here -
Last week I looked at my house bank and the batteries were swelling and the hydrometer was showing all cells in the red. So I pulled all batts to clean up all the rust in the tray and Ospho/paint it. The Chassis batteries measured good with a hydrometer and also measured 12.6V each. I replaced the House batteries with Trojan brand. I reinstalled/wired up both banks and charged them overnight via shore power.
Back to the main point (and after batts replaced)-
In the meantime I read a lot of threads about HWH air leveling here and Paul (azpete, from HWH) mentioned a few important things (at least to me they were) - 1) if the travel light is on, on the control pad, the relays at the main dump/fill valve are open and the ride height valves control the air. So I checked that out and the travel light was on. Hmmm, why wouldn't it air up?
2) Paul said that HWH does not control the air if the parking brake is released. I climbed into the drivers seat and noticed the front tank gauge showed it almost empty but the rear was still around 100. I pumped the brakes a couple times and saw the front gauge fluctuate. I released and re-activated the air brake. I saw on the HWH control pad that the "air brakes not engaged" light go on and off. So it seemed that HWH was not over-riding the main dump/fill valve and was displaying what I was hoping it would.
I then started the coach and sure enough the coach started airing up and the purge valve sounded off at regular intervals. YAY. Maybe disconnecting and re-connecting the batteries helped?
I took the coach for a ride to get the fluids up to temp and after about 5 mins a horn started beeping under the dash (I've never heard this horn before an it's not the turn signal horn) - I checked all the lights on the dash - nothing lit, I looked at all the gauges and everything looked normal. I kept driving and watched the engine temp going up but the tranny was around 100 and not moving much. I kept driving and after maybe 5 more mins the horn silenced and then the tranny temp started rising and eventually both engine and tranny got to about 170 degrees and hovered there. I have no clue what the horn was telling me. I didn't hear it again all the way home.
Anyone have a horn sound off from under the dash but not have any bad indications on the dash or lights?
Note to self, don't let the coach sit without taking it for a ride every month or two.
I guess this is what happens when you ignore the coach for all those months while isolating and forget how it works. What a dope. 
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