Foretravel Motorhome Forums => Foretravel Tech Talk => Topic started by: juicesqueezer on August 20, 2019, 08:35:21 am
Title: Compressor going on and off!
Post by: juicesqueezer on August 20, 2019, 08:35:21 am
Well, it seems this is the month for little items to trouble shoot! We arrived at our new destination yesterday and set the coach up. A few minutes later, I heard the compressor kick on, but shut of in less than 10 seconds. Looked at the air gauges on the dash and both were at or near 70 lbs. About 5 minutes or less goes by and the compressor kicked on again. It did this all night long and still this doing this now! I did have to raise the coach up several times coming out of and then back into a steep area to keep front or rear dragging. Could this be the issue with maybe a valve sticking? I believe this is the compressor for the slide bladder and the HWH system.
Normally, with coach sitting, the compressor might come on once or twice a day and the air gauges would then air up to approximately 110 lbs. It would bleed down over time, but very slowly. Any ideas out there to stop this constant running of the compressor? Once you hear it, you hear it all night! UGH! Would going back into travel mode again and raise the coach up and then dump the air work? Just thinking out loud! Any help on this would be most appreciated. Thanks in advance!
Title: Re: Compressor going on and off!
Post by: Dub on August 20, 2019, 09:08:03 am
I don't have a slide so I don't know the effects on one but what I do after I park and level , I turn the HWH off , that stops compressor from coming on.. My air bags have no leaks so I stay level even with no noisy compressor.
Title: Re: Compressor going on and off!
Post by: juicesqueezer on August 20, 2019, 09:24:14 am
I don't have a slide so I don't know the effects on one but what I do after I park and level , I turn the HWH off , that stops compressor from coming on.. My air bags have no leaks so I stay level even with no noisy compressor.
Dub, yes, that would work, but I still want to figure out why it is doing what it is doing. We have a new bladder seal and all new air bags, so should be good to go there. Hoping someone out there has had this happen and can offer a solution to issue!
Title: Re: Compressor going on and off!
Post by: Dub on August 20, 2019, 09:37:54 am
You have an air leak somewhere.. Only way a "stuck" valve would be the issue is if one were stuck open... but you could hear that and I'm assuming you can't hear the leak..You know the drill on finding air leaks.. Myself I would do as I said until I got back home to my shop with a creeper and concrete floor. Maybe someone knows a "quicker fix", but my search for air leaks has never been quick.
Title: Re: Compressor going on and off!
Post by: Dub on August 20, 2019, 09:44:50 am
Won't hurt anything to go thru the process you mentioned but I have doubts stopping the leak doing so.
Title: Re: Compressor going on and off!
Post by: juicesqueezer on August 20, 2019, 11:57:08 am
Turned off the HWH and the compressor still ran. It would go from around 72 lbs down to 70 and then kick back on, so I pulled the 20 amp fuse that is located at the compressor and that stopped the compressor from coming on. After several hours, air tanks are still at same pressure as when I pulled the fuse, so there should be not be a valve leaking. Something is not allowing the compressor to pump air past a couple of pounds of air and shut off. I know there is a pressure regulator on the pump, but not sure if that is the issue. Anybody else have an idea? I agree Dub, a creeper and a concrete floor would be ideal to find leaks, but with the pressure not dropping, I don't think that is the issue!
Title: Re: Compressor going on and off!
Post by: John S on August 20, 2019, 12:05:14 pm
You have a leak and the one way valve is stuck open. It should not pump up to 110 on the air gauges.
Title: Re: Compressor going on and off!
Post by: Roger & Susan in Home2 on August 20, 2019, 12:26:07 pm
Joe, there are hundreds of places for leaks. Find your air system schematic and study it carefully. Unless to have failed check valves or your air system has been modified then the HWW compressor will do nothing (and should not) with the front and rear service tank pressures.
The compressor comes on when the pressure switch closes or the HWH box tells it to come on.there are check valves between the compressor and everything else. First place to look is near the compressor at the water separator bowl.
Add a switch to shut the compressor. Good place for this is between the pressure switch and the compressor start relay.
Title: Re: Compressor going on and off!
Post by: juicesqueezer on August 20, 2019, 03:12:41 pm
You have a leak and the one way valve is stuck open. It should not pump up to 110 on the air gauges.
John, is it possible the valves that raise the coach higher when in travel mode are stuck open? Would it then be possible if that is true, then I would not hear or find a leak, since the compressor won't go above that 72 lb pressure? Hope this makes sense! Where we are set up, it is almost impossible to get under the coach, unless you are as slim as a pencil! lol
Title: Re: Compressor going on and off!
Post by: juicesqueezer on August 20, 2019, 03:19:17 pm
Joe, there are hundreds of places for leaks. Find your air system schematic and study it carefully. Unless to have failed check valves or your air system has been modified then the HWW compressor will do nothing (and should not) with the front and rear service tank pressures.
The compressor comes on when the pressure switch closes or the HWH box tells it to come on.there are check valves between the compressor and everything else. First place to look is near the compressor at the water separator bowl.
Add a switch to shut the compressor. Good place for this is between the pressure switch and the compressor start relay.
Roger, this is the small compressor in the large bay area with the slide tray. I have been in there and there are no leaks in or around that compressor. Compressor comes on at or about 70 lbs. and then shuts off at about 72 lbs. and the pop off valve releases pressure. I never had an issue until I raised the coach yesterday while in travel mode to clear the sloping ground. After that, the compressor started doing what it is doing now until I pulled the inline fuse by the compressor. I may try moving to another site and try raising the coach in Travel Mode and then try to re level the coach and see what happens. Will let you all know the results!
Title: Re: Compressor going on and off!
Post by: juicesqueezer on August 20, 2019, 04:47:16 pm
Here are some photos of our compressor and assembly of the system itself. I do have the ZipDee air awning, but it is disconnected and has never worked since I have owned the coach. Just a reference to maybe seeing extra air lines in the photos. Photo #1 shows the collection glass and the pop off valve. There is no air coming out of that pop off when pulled now. Photo #2 is the system itself. Photo #3 shows the electric switch at the top with cover off and down below, you can see the cover for the fuse that I removed to stop the compressor from running.
Title: Re: Compressor going on and off!
Post by: Roger & Susan in Home2 on August 20, 2019, 06:45:37 pm
Your pressure switch might be bad, these should go up to about 100 psi and shuts off the compressor. It closes at 20 psi below where it opens and turns the compressor on again. Find your air schematic drawing. Your coach is different from mine.
This schematic starts with build number 5871. I don't have any earlier ones.
Title: Re: Compressor going on and off!
Post by: AC7880 on August 20, 2019, 08:26:03 pm
Any chance the front end is raised to maximum height in your current location? That can will induce compressor run and then pop off to pop.
I had this happen one time. Driving the front tires up onto to 2" boards, then hitting re-level ended the problem.
Title: Re: Compressor going on and off!
Post by: juicesqueezer on August 20, 2019, 09:12:33 pm
Thanks Roger! Going to call James at FOT tomorrow and see what he suggests I screw up first! lol Just got back to the coach and looked at the two air gauges on the dash and they both have dropped down below 70 lbs. Top one was down to approx 62 and bottom gauge down to about 66. Of course I have had the compressor shut down with removal of the fuse.
Title: Re: Compressor going on and off!
Post by: juicesqueezer on August 20, 2019, 09:13:55 pm
Any chance the front end is raised to maximum height in your current location? That can will induce compressor run and then pop off to pop.
I had this happen one time. Driving the front tires up onto to 2" boards, then hitting re-level ended the problem.
Dan, we are sitting low compared to some sites we have come into. lol
Title: Re: Compressor going on and off!
Post by: juicesqueezer on August 23, 2019, 06:07:49 pm
Update: Heard back from Ronnie at FOT and he did some checking and believes it is a valve that is stuck in the compressor itself. Suggested a light tap with the hammer and see if that rectifies the issue. On Monday, I am going to move the coach a few feet and raise and lower the coach, go to ride height and then level and see what happens. Will give an update after that.
Title: Re: Compressor going on and off!
Post by: juicesqueezer on September 06, 2019, 08:17:44 am
2nd Update: We move the other day to another RV park and still have an issue with the compressor in the bay. We tried the tapping with the hammer (rubber) and no luck. Raised the coach and then lowered it, still the same. The day we left, the gauges on the dash were both at zero; so I then put the fuse back in that I had removed to stop the compressor from running and the compressor started right up and then kicked off. So, now it will not even put air into that small tank. Decided to just see what happens further and started the coach and the air pressure came right up to 110/115, had brakes and deflated the slide seal to retract slide and all was good there. Brought the slide in and inflated the slide seal and again, all went well. So, down the road we went with no issues. Arrived at our next RV park and same thing. Once we shut the coach down, the small compressor would continued to run and shut off almost immediately. Now I am wondering if we have a bad pressure switch, that is mounted in front of the compressor? Calling Foretravel is not what it once was as before with James. I know that Ronnie is overwhelmed and doing his best, but it takes sometimes a full day before he can get back to someone with an issue. He and I both have been patient with this and we may have to live with this until we head back to Texas sometime in January. Just have to pull the fuse to stop the insane running of the compressor.
Title: Re: Compressor going on and off!
Post by: Travelin' Man (RIP) on September 06, 2019, 09:11:16 am
Heard back from Ronnie at FOT and he did some checking and believes it is a valve that is stuck in the compressor itself.
The only valves in my compressor are reed valves and they don't get stuck............. do they?
https://m.youtube.com/watch?v=8TI98cs85ew
Title: Re: Compressor going on and off!
Post by: kathyg on September 06, 2019, 09:40:19 am
Juicesqueezers, do you have the air schematic?
The dash gauges show the front and rear brake tanks. Not the wet tank nor the slide seal tank. You need a gauge near the aux compressor to see whats happening at the s/o tank.
Title: Re: Compressor going on and off!
Post by: Michelle on September 06, 2019, 09:51:56 am
Do you hear any air leaking near the compressor? Is the unloader solenoid leaking? Are there any cracks in the condensation bowl?
Do you hear any air leaking near the transmission?
KathyG posted while I was typing. Don't assume the compressor is trying to air up the main tanks (what does your air schematic look like?) If you do not have an "air tank" switch by the driver's elbow, then there is not a solenoid to do that and it does not put air into those tanks. If there is such a switch, it is possible the check valve or that solenoid is leaking through (we had that on our '03, but your '02 may not have that switch/solenoid/check valve scheme.)
Title: Re: Compressor going on and off!
Post by: Chuck & Jeannie on September 06, 2019, 10:22:44 am
I feel a sense of frustration when I read threads like this. You have a simple problem: your air compressor runs at the wrong times or shuts off at the wrong time. It is cycling on/off rapidly. Why? It should be fairly easy to solve this problem with simple trouble shooting skills.
Step 1: What powers your air compressor? You know the answer to this because you have removed the fuse from the power wire.
Step 2: What tells the compressor to turn ON and OFF? You already know the answer to this because you have taken the cover off the pressure switch and pointed it out in your photos in Reply #10.
Step 3: If compressor is getting power (YES) but is turning ON or OFF at wrong times/pressures, what causes this? Answer: the pressure switch.
Step 4: How best to solve the problem? Answer: replace the pressure switch.
Discussion. The pressure switch is similar to the ones you will find on many air compressors, and also on water well pump controls. It employs a diaphragm to sense pressure, and spring loaded contact points that open and close to control power to a motor. One common problem is that the contact points will get dirty or eroded, and will not maintain the proper gap. Bad/dirty/corroded points can cause the switch to act erratically. If this IS the problem, you can "dress" the points (clean them up) with a "points file" and possibly restore proper operation...temporarily.
Another possible problem is the diaphragm can develop a tiny leak, causing erratic switch operation.
Another possible problem is the port into which the switch is installed can get plugged up with junk, causing erratic switch operation.
Occasionally, the switch operation can be restored by screwing the adjustment nut (on top of the big spring) in or out a bit. This nut is normally used to raise or lower the "kick in" and "kick out" settings on the switch. You could try messing with it to see if it makes any worthwhile change in your compressor's operation, but it probably won't help.
Once again: the SIMPLE solution is replace the pressure switch.
Once your compressor is back to operating at correct times and pressures, THEN you can go hunting for air leaks.
Title: Re: Compressor going on and off!
Post by: Pamela & Mike on September 06, 2019, 10:32:22 am
Here is another thought about this rapid compressor cycling.
After looking at a generic air schematic for a 2000 (not the one for his exact coach) it shows a ball check valve just past the pressure switch. If this check valve has failed and is stuck closed it could be slowly bleeding through causing the pressure switch to see a need to come on. When the piping between the 2 is up to pressure the pressure switch is satisfied and shuts the compressor down.
Mike
Title: Re: Compressor going on and off!
Post by: TMPeace on September 06, 2019, 11:08:08 am
I had a similar issue a while back, and it ended up being an air bag leaking. We had been in some sites where the rear end had to raise to max height and I guess all the extra work found a weak spot in the left rear bag. Replaced air bag and no more cycling of the pump. Hope this helps and good luck.
Tracy
Title: Re: Compressor going on and off!
Post by: juicesqueezer on September 06, 2019, 02:07:17 pm
Do you hear any air leaking near the compressor? Is the unloader solenoid leaking? Are there any cracks in the condensation bowl?
Do you hear any air leaking near the transmission?
KathyG posted while I was typing. Don't assume the compressor is trying to air up the main tanks (what does your air schematic look like?) If you do not have an "air tank" switch by the driver's elbow, then there is not a solenoid to do that and it does not put air into those tanks. If there is such a switch, it is possible the check valve or that solenoid is leaking through (we had that on our '03, but your '02 may not have that switch/solenoid/check valve scheme.)
No switch there! I am missing the air schmatic for our coach. Have the full book, but those pages are missing. Not sure why! When all was working well, when we would park and gauges slowly lost air over 8 hours, then the small compressor would come on, put 110/115 in the gauges on the dash and then shut off till air reached 70 +- lbs and then kick back on. This happened about once a day. When coach was back at MOT for air leaks and those major ones were repaired, the consensus was that the leak down over that time frame was acceptable and I had no issues with it either. This all started when I raised the coach up to go over a rise in the road. I can not hear any air leaking, so leakage must be minute!
Title: Re: Compressor going on and off!
Post by: juicesqueezer on September 06, 2019, 02:18:01 pm
The dash gauges show the front and rear brake tanks. Not the wet tank nor the slide seal tank. You need a gauge near the aux compressor to see whats happening at the s/o tank.
Unfortunately no! Am going to contact Ronnie and see if I can get a schematic sent to me via email!
Title: Re: Compressor going on and off!
Post by: juicesqueezer on September 06, 2019, 02:23:31 pm
Here is another thought about this rapid compressor cycling.
After looking at a generic air schematic for a 2000 (not the one for his exact coach) it shows a ball check valve just past the pressure switch. If this check valve has failed and is stuck closed it could be slowly bleeding through causing the pressure switch to see a need to come on. When the piping between the 2 is up to pressure the pressure switch is satisfied and shuts the compressor down.
Mike
Mike, if you look at the photos I posted at the begining, see if that brass rectangular block is the valve? That just might be it. When the compressor calls for air, if the valve is shut, it senses the air tank is full and shuts off. That is what it seems to be doing. If there is no air in the tank and I insert the fuse to start the compressor, it kicks on and then back off almost immediately. If there is air on the gauges and it get to 70 lbs., then the pressure switch calls for air and if it senses the tank is full, it shuts back down. Like Ronnie mentioned, he spoke with those in the service area about this and that is all they could come up with as a stuck check valve. Please let me know what you see in those photos with regards to a check valve.
Title: Re: Compressor going on and off!
Post by: juicesqueezer on September 06, 2019, 02:36:58 pm
I feel a sense of frustration when I read threads like this. You have a simple problem: your air compressor runs at the wrong times or shuts off at the wrong time. It is cycling on/off rapidly. Why? It should be fairly easy to solve this problem with simple trouble shooting skills.
Step 1: What powers your air compressor? You know the answer to this because you have removed the fuse from the power wire.
Step 2: What tells the compressor to turn ON and OFF? You already know the answer to this because you have taken the cover off the pressure switch and pointed it out in your photos in Reply #10.
Step 3: If compressor is getting power (YES) but is turning ON or OFF at wrong times/pressures, what causes this? Answer: the pressure switch.
Step 4: How best to solve the problem? Answer: replace the pressure switch.
Discussion. The pressure switch is similar to the ones you will find on many air compressors, and also on water well pump controls. It employs a diaphragm to sense pressure, and spring loaded contact points that open and close to control power to a motor. One common problem is that the contact points will get dirty or eroded, and will not maintain the proper gap. Bad/dirty/corroded points can cause the switch to act erratically. If this IS the problem, you can "dress" the points (clean them up) with a "points file" and possibly restore proper operation...temporarily.
Another possible problem is the diaphragm can develop a tiny leak, causing erratic switch operation.
Another possible problem is the port into which the switch is installed can get plugged up with junk, causing erratic switch operation.
Occasionally, the switch operation can be restored by screwing the adjustment nut (on top of the big spring) in or out a bit. This nut is normally used to raise or lower the "kick in" and "kick out" settings on the switch. You could try messing with it to see if it makes any worthwhile change in your compressor's operation, but it probably won't help.
Once again: the SIMPLE solution is replace the pressure switch.
Once your compressor is back to operating at correct times and pressures, THEN you can go hunting for air leaks.
Your steps make perfect sense. I don't know if there is a special pressure switch for these or not, but getting it off will not be fun, as it is up against the ceiling for the bay. Looks like I will need to drop the compressor down or part of it to remove the switch. If anyone has the part number for this switch, I would appreciate you post it. I may try the file first as well. I know that Roger suggested the pressure switch as well in a previous comment.
Title: Re: Compressor going on and off!
Post by: Chuck & Jeannie on September 06, 2019, 03:20:26 pm
If anyone has the part number for this switch, I would appreciate you post it. I know that Roger suggested the pressure switch as well in a previous comment.
The HWH part number for the pressure switch is RAP90159. But that won't help you if you can't cross it to another part number.
The Forum to the rescue! As is often the case, you are not the first member looking for a pressure switch. See link below (Reply #9 and #10):
Aux 12 volt compressor compartment "thumping" sound (actually air unloader) (https://www.foreforums.com/index.php?topic=34259.msg314770#msg314770)
Title: Re: Compressor going on and off!
Post by: Pamela & Mike on September 06, 2019, 06:45:45 pm
if you look at the photos I posted at the begining, see if that brass rectangular block is the valve? That just might be it.
Joe,
I have been looking at both your pics. and the generic prints for your year coach that I have. The first thing I see is some of the stuff in the pics. must be for an air operated awning. According to what I can see in the prints that I have you must have a check valve either in that square block or in one of the fittings that are screwed into that block. This is the piece that has the drain valve, air lines, and pressure switch connected to it.
One other thing that you have mentioned in an earlier post is that before this problem of rapid cycling that little compressor would air up your main tanks. You stated that this was visible on the dash gages. This leads to your 2nd problem in that you have a isolation valve that is leaking from your seal air tank back into the front dry air tank. Do you have an air tank switch on your console? If so the valve that is connected to that switch is what is leaking through charging your main dry air tanks. That little compressor isn't designed for such service and can cause it to fail prematurely.
Mike
Title: Re: Compressor going on and off!
Post by: Green99 on September 06, 2019, 08:13:41 pm
Another thing, before filing the contacts in the pressure switch be sure there is no power going to the contacts.
Title: Re: Compressor going on and off!
Post by: juicesqueezer on September 07, 2019, 08:11:40 am
I have been looking at both your pics. and the generic prints for your year coach that I have. The first thing I see is some of the stuff in the pics. must be for an air operated awning. According to what I can see in the prints that I have you must have a check valve either in that square block or in one of the fittings that are screwed into that block. This is the piece that has the drain valve, air lines, and pressure switch connected to it.
One other thing that you have mentioned in an earlier post is that before this problem of rapid cycling that little compressor would air up your main tanks. You stated that this was visible on the dash gages. This leads to your 2nd problem in that you have a isolation valve that is leaking from your seal air tank back into the front dry air tank. Do you have an air tank switch on your console? If so the valve that is connected to that switch is what is leaking through charging your main dry air tanks. That little compressor isn't designed for such service and can cause it to fail prematurely.
Mike
Mike, I don't have a switch on the dash, but do have the air awning, which I believe I mentioned before, but if not, sorry! The air line to awning is plugged off as the awning is inoperative. I will trace those air lines as well. When I was at MOT to have some issues resolved after we purchased the coach, Derek who runs the show across the street was aware of the drop in air pressure that I was experiencing and got it narrowed down to a very slow leak, which took approximately 8 hours before the small compressor would come on. They never said anything about a seal valve leaking, etc. I am going to give Derek a call next week and see what he says and order a print out of our air system from FOT. Thanks again for your expertise in this as well as others who have chimed in here and given me more information on this system.
Title: Re: Compressor going on and off!
Post by: Pamela & Mike on September 07, 2019, 08:39:01 am
I am going to give Derek a call next week and see what he says and order a print out of our air system from FOT.
That will be a big help in troubleshooting your air system problems.
Mike
Title: Re: Compressor going on and off!
Post by: Tim on September 08, 2019, 04:18:06 am
Thanks Chuck and Jeannie for your clear explanation. My aux compressor hasn't worked in three years, but you have given me the impetus to try to fix it.
Title: Re: Compressor going on and off!
Post by: Travelin' Man (RIP) on September 17, 2019, 02:05:05 pm
so I pulled the 20 amp fuse that is located at the compressor and that stopped the compressor from coming on.
Mine calls for a 5amp fuse. 20 amp seems kinda' stout.
Title: Re: Compressor going on and off!
Post by: BILL FORE on September 26, 2019, 09:40:08 am
I understand your frustration....have spent a lot of time on my aux air system.
The post by Chuck may be right on.
Just a couple of thoughts based on your scenario.
the air gauges on dash reflect your front and rear air tanks....used for brakes and air bags when in motion...these gauges do not reflect pressure in the hwh leveling system aux tank
you said the air compressor runs very short cycles...does not sound correct operation....i put a air pressure gauge on the the aux system so i know the shutoff pressure when i need to troubleshoot the aux air system.....i adjusted the pressure switch to shutoff at 100 psi....system seemed to be working long and hard to boost pressure above 100 psi
if dash air gauges go up when the aux compressor run then suspect "air tank" switch on allowing air to go to front and rear air tanks....or....the check valve is leaking air from the aux system to the front/rear system
if you put an air pressure gauge on the aux system you can verify the shutoff pressure....if shutoff pressure is low then suspect pressure switch....if shutoff pressure is high and compressor still runs short cycles then suspect pressure switch(i.e. shutoff pressure is correct but pressure switch signals low pressure reached incorrectly....in this case you will see pressure gauge indicate high pressure shortly after compressor starts)....if shutoff pressure is correct and compressor runs long cycles( you can watch pressure gauge to see pressure build up) then suspect air leak
Title: Re: Compressor going on and off!
Post by: DavidS on September 26, 2019, 09:58:34 am
Ok maybe I have this backwards... I always thought the front and rear air gauge was for ride height? It is not? its for the brakes?
My front gauge stopped working after the rear axle seal replacement... next on the list to find the issue.. was thinking 6 pack but now I am not sure.. no work was done anywhere near the six pack.. :(
Title: Re: Compressor going on and off!
Post by: craneman on September 26, 2019, 11:49:33 am
Ok maybe I have this backwards... I always thought the front and rear air gauge was for ride height? It is not? its for the brakes?
My front gauge stopped working after the rear axle seal replacement... next on the list to find the issue.. was thinking 6 pack but now I am not sure.. no work was done anywhere near the six pack.. :(
David, I believe you have the "box" that electronically transmits to the gauge and has been problematic in the past. And the air gauges are showing the pressure for the 2 air brake systems.
Title: Re: Compressor going on and off!
Post by: juicesqueezer on September 26, 2019, 01:47:27 pm
Ok maybe I have this backwards... I always thought the front and rear air gauge was for ride height? It is not? its for the brakes?
David,
The front and rear gauges are for the front and rear dry air tanks, they don't just read for the HWH ride height. They are storage tanks that serve the brakes and all aux. air operated stuff like retarder, horn, HWH, and step cover.
Your 02 should have the magic box like Cman mentioned that converts air pressure to an electronic signal and sends that signal to the electronic gauge.
Mike
Title: Re: Compressor going on and off!
Post by: juicesqueezer on September 26, 2019, 02:06:10 pm
Sorry for no updates on my compressor issues lately, but have just been removing the fuse for the time being. Coach airs up fine and no issues going down the road with regards to brakes, etc. Ride height has been working and leveling works fine. Bladder for slide seal is okay as well. We will be in Florida in November and part of December and will be having the air awning removed and replaced with the manual zip dee! We are then heading up to see kids in TN and then make our way over to Moscow, IA and HWH to check out this system before we head down to Q. Hope we don't freeze to death before then! lol A huge thank you to all who have responded and sent PM's. At least right now, we are not listening to the compressor kicking on and off and the rest of the air system seems to work fine. We also have a thermo disc coming in on Friday for the high limit on the diesel side of the Aqua Hot. It quit! Thank you Rudy for your expertise and link for the part. I will try and post some photos of the thermo discs and my contortions inside of that bay. I am glad I'm not taller than 6 foot! lol
Title: Re: Compressor going on and off!
Post by: DavidS on September 26, 2019, 02:10:32 pm
The front and rear gauges are for the front and rear dry air tanks, they don't just read for the HWH ride height. They are storage tanks that serve the brakes and all aux. air operated stuff like retarder, horn, HWH, and step cover.
Your 02 should have the magic box like Cman mentioned that converts air pressure to an electronic signal and sends that signal to the electronic gauge.
Mike
I will start another topic.. already muddled this one.. thanks guys
Title: Re: Compressor going on and off!
Post by: Roger & Susan in Home2 on September 26, 2019, 02:38:29 pm
The compressor is isolated from everywhere it sends air by check valves. The pressure control switch is between those check valves and and another check valve between the pressure control switch and the end of the filters and dryers. So if the check valves are working and the switch keeps coming on and calling for air then there is a leak between check valves.
The HWH system can also send a signal that will close the Essex relay and turn on the pump. The dash switch to open the relay to supply air to the wet tank will also send a signal to start the pump.
Title: Re: Compressor going on and off!
Post by: jchoate45 on July 10, 2021, 03:26:35 am
great thread here. if anyone is willing to help and talk with me i'd greatly appreciate it. i just need to make sure my bladders are working. they have been working fine but i think we have a similar problem as this thread but i'm a newb too so could be something easier to try