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Old 04-02-2021, 02:05 PM   #1
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HWH "Excess Slope" Error on Level Ground

I thought I would post about the issue I had since I couldn't find it in the archives anywhere.

Basically, when I got on level ground and went to Auto Level the coach, the bags would dump normally, but as soon as the 1st jack started to deploy I would get the "Excess Slope" error and it would stop leveling completely. I would then have to hit "Auto Store" and try again, but to no avail. I WAS able to level the coach manually.

Many suggested to do a system reset, but on our 2018 MA I could not find a reset button or a fuse to pull so I basically shut down the 12V system for a minute or two (at the suggestion of Newmar) to try and reset but that didn't work either.

I was hesitant to call HWH because there are many postings here with less than stellar reviews about HWH customer service but I found the complete opposite. They took my info and a tech emailed me within 4 hours and diagnosed it perfectly.

Bottom line is that it is a system pressure sensor switch that is stuck closed. Part #RAP8921 and can be ordered directly from HWH for about 100 bucks shipped.

So, moral of the story here. If you are on level ground, and your Auto Level function dumps the air, but then gives you an Excess Slope error 1-2 seconds after trying to deploy the 1st jack, it is most likely the system pressure sensor switch.

Again, even if the switch is bad you can still use the Auto Store Function to bring the initial jack back to it's fully retracted position and level the coach manually until you can have the switch replaced.
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Old 04-02-2021, 02:19 PM   #2
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Thanks for sharing the good information
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Old 04-05-2021, 05:13 PM   #3
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Pressure Switch

Quote:
Originally Posted by Jtrving View Post
I thought I would post about the issue I had since I couldn't find it in the archives anywhere.

Basically, when I got on level ground and went to Auto Level the coach, the bags would dump normally, but as soon as the 1st jack started to deploy I would get the "Excess Slope" error and it would stop leveling completely. I would then have to hit "Auto Store" and try again, but to no avail. I WAS able to level the coach manually.

Many suggested to do a system reset, but on our 2018 MA I could not find a reset button or a fuse to pull so I basically shut down the 12V system for a minute or two (at the suggestion of Newmar) to try and reset but that didn't work either.

I was hesitant to call HWH because there are many postings here with less than stellar reviews about HWH customer service but I found the complete opposite. They took my info and a tech emailed me within 4 hours and diagnosed it perfectly.

Bottom line is that it is a system pressure sensor switch that is stuck closed. Part #RAP8921 and can be ordered directly from HWH for about 100 bucks shipped.

So, moral of the story here. If you are on level ground, and your Auto Level function dumps the air, but then gives you an Excess Slope error 1-2 seconds after trying to deploy the 1st jack, it is most likely the system pressure sensor switch.

Again, even if the switch is bad you can still use the Auto Store Function to bring the initial jack back to it's fully retracted position and level the coach manually until you can have the switch replaced.

I had the same problem when my coach was new. Dealer said it was the slope in the parking lot. One of the items on my warranty list for my first trip to Newmar. As soon as I told the tech he said it's probably the pressure switch and it turned out he was right. He unhooked the switch and auto-leveled the coach without a problem to prove that was the culprit. Changed the switch and I haven't had any more problems unless I am too unlevel to level. A lot of times in that case you can still do it manually I've discovered.
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Old 04-07-2021, 06:05 AM   #4
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Where is this pressure switch located?
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Old 04-07-2021, 08:40 AM   #5
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on the side of the jack.
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Old 12-18-2021, 05:16 AM   #6
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Quote:
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on the side of the jack.
I had the same thing happen to me yesterday.... on a level pad and went to do auto level and get the excessive slope light on. I was able to manually level.
How do I tell what jack/pressure switch is the culprit ? Can I unplug it as a work around till I get the replacement part ?
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Old 12-18-2021, 06:27 AM   #7
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My coach is older, so things might be different, but I have a system pressure switch on the manifold where all of the solenoids are (HWH 610).



Older coachs sometimes will not auto level because the original switch was 3000 pounds per square inch. The new switchs are 3800#s.
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Old 12-18-2021, 09:04 AM   #8
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Ditto on the issue to me as well. Turns out the wires had been chewed into where they exit the wire tray at the rear of the coach. Once I fixed that with new wire, problem solved.
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Old 12-18-2021, 11:26 AM   #9
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It shows both a high pressure (3000) and low pressure (50) switch on the HWH 625. Do you know which one you replaced?
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Old 12-19-2021, 06:31 PM   #10
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Following, since I'm having my own possibly related issues with my jacks, and interested to hear more about this.
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Old 05-20-2022, 09:28 AM   #11
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the pressure switches, located on the side of each jack, are the culprit.with the jacks retracted, unplug the single wire connector at the top of the jack.do an ohms test on the wire going to the sensor. it should be open. if it shows ground, replace it. they just screw off and back on with the new. very little fluid loss.
replacing the zip ties on the side of the jack are the hardest part.
if you have problems, i am available for questions.
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Old 05-20-2022, 12:12 PM   #12
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Quote:
Originally Posted by azpete View Post
the pressure switches, located on the side of each jack, are the culprit.with the jacks retracted, unplug the single wire connector at the top of the jack.do an ohms test on the wire going to the sensor. it should be open. if it shows ground, replace it. they just screw off and back on with the new. very little fluid loss.
replacing the zip ties on the side of the jack are the hardest part.
if you have problems, i am available for questions.
602 549 3638
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i work full time for hwh corp. i do not solicit part sales on this forum.
i only do work by assignment by hwh corp.
Thank you for posting.
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Old 05-20-2022, 10:27 PM   #13
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I have mine show excess slope on level pads frequently. I simply retract all the way back then hit auto level again and it seems to work fine. Am I close to a malfunction?
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Old 05-21-2022, 05:48 AM   #14
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Quote:
Originally Posted by azpete View Post
the pressure switches, located on the side of each jack, are the culprit.with the jacks retracted, unplug the single wire connector at the top of the jack.do an ohms test on the wire going to the sensor. it should be open. if it shows ground, replace it. they just screw off and back on with the new. very little fluid loss.
replacing the zip ties on the side of the jack are the hardest part.
if you have problems, i am available for questions.
602 549 3638
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i work full time for hwh corp. i do not solicit part sales on this forum.
i only do work by assignment by hwh corp.
Thanks for the expert advise !
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