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HWH air leveling part #’s for pressure switches and solenoids for a 2002 Monaco Signature 40

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Does anyone have the part numbers and a source for HWH air leveling components?

I need to purchase replacement solenoids and 20#  and 85# pressure switches for my 2002 Signature 40.

Thank You,


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Here is what I have when I did my.

Replacement HWH Air Solenoid RAP1940 IN STOCK TODAY

Product Code: RAP1940    $103.95

From <http://www.nwrvsupply.com/product/RAP1940.html>



Replacement HWH Air Solenoid RAP1940 

HWH Air Solenoid RAP90989

Straight Hatching, Normally Closed, 5/32" Orifice. 

From <http://www.nwrvsupply.com/158/RAP90989.html>

Coil assembly av a5983-103

HWH Computerized Leveling Control Panel RAP24249(RAP91137) -CHECK LEAD TIME-

Product Code: AP24249

Price: $285.62

From <http://www.nwrvsupply.com/product/AP24249.html>

HWH AIR Manifold Pigtail AP25285

Product Code: AP25285

Price: $19.95

From <http://www.nwrvsupply.com/158/AP25285.html>

HWH Check Valve Kit for AIR RAP6553 Two(2) Pack - Ships Today!!

Product Code: RAP6553

Price: $19.95

From <http://www.nwrvsupply.com/158/RAP6553.html>

85 PSI

RAP90570 HWH Air Pressure Switch -CHECK LEAD TIME-

Product Code: RAP90570

Price: $114.95

From <http://www.nwrvsupply.com/158/RAP90570.html>

20 PSI

HWH RAP1720 (AP15197) Pressure Switch by Nason

Product Code: RAP1720

Price: $85.00



my post https://www.irv2.com/forums/f115/hwh-2000-leveling-leaning-in-travel-mode-538584.html#post5767342

HWH Computerized Leveling Control Panel RAP24249(RAP91137) $285.62

From <http://www.nwrvsupply.com/158/AP24249.html>

PART CHANGED TO RAP91137.  2000 Series Leveling

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Thank for  the  parts information!

 I’m a newbee about this HWH system and do not know how to make a positive identification of the HWH system number my coach has.  

Is my 2002 Signature Centurion with tag axel have the same model HWH system as your 2004 Executive?

I think mine is a 2000 series according to P Maddox.

I want to order some spares but want to make sure they are the corrrect ones for my coach.  When I am under the coach I am not able to read any part numbers on the solenoids and pressure switches, etc.

I have questions about testing pressure switches and solenoids with an ohm meter but will start a new thread so this one doesn’t get hijacked.





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I'm pretty sure that you have the same HWH system as mine. It's so much easier to remove the whole off the coach and rebuild it on a table. Leve all the connection on the solenoid and disconnect the canon plug on top, Label all air line. I'm sure that you took a lot of pictures.

If you replace the back up pump be aware the the power connector that plug into the compressor which is RED and BLACK. The back lead is NOT A GROUND. Both wire are hot. The black wire is powered by the house batteries.  



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Thanks for the photos.  The components on your manifold look similar to mine. I think they are the same parts.

Before I try to take the manifolds off the coach I tested all the connections.  My rear manifolds are pretty corroded and I am concerned about being able to remove the solenoids.    How do you remove the solenoids?  When removing the pressure switches do they just unscrew from the manifold?

I disconnected the connectors for the solenoids and pressure switches one at a time and checked them with an ohm meter.  Both rear manifolds only have  solenoids-no pressure switches.  They all had 15 ohms reading, so I am assuming that means they are ok?  On the front manifold the solenoids check out at a little over 14 ohms.  I assume that means they are ok.  However one of the two 20lb pressure switches on the front manifold showed an open connection and the other showed it was shorted.  Does that mean they are both bad?  I had the air dumped from the system when I was testing.

I need to replace the Aux compressor.  Is the one in your photo the Viair 450C?

Here’s a couple of photos of the rear and front manifolds and my old Aux compressor.






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Here is a good site for more information.

Complete disassemble and install http://www.allthingsforetravel.com/?s=hwh+air+level


You do not need to remove the solenoid to replace the pressure switch. Are the solenoid leaking some air? If you're going to reseal the solenoid, make sure you replace all 3 O-rings.

From Paul Whittle, This is the wrench you need to take the solenoids apart to get to the inner o-ring.

Newco 202079 Spanner Nut Wrench https://www.amazon.com/dp/B007PCOBCE..._-TgNBbHXBBKW6

Amazon is out of stock https://discountcoffeeequipment.com/repair-parts-c-19/newco-c-19_59/newco-202079-spanner-nut-wrench-p-39757.html



Yes, the backup pump is Viair 450C https://www.viaircorp.com/ig-series/450c-ig 

I used viair pressures switch w/relay 90 PSI on and 120 PSI off. I notice my pump will try to keep the air tank air up to 120 PSI. I don't think that it suppose to do that. I still need to figure that one out. Your pump mount in the same location as my and when the pump run in the middle of the night it'll make you want to get up and turn it off. So I put in a 30 amps house light switch with a outdoor weather box to turn it off manually. Make sure that you wire the pump up correctly, if not you'll have a big big headache with the HWH controller box . The coach will do thing that you don't want it to do! Don't ask how I know it kind of embarrassing.

Let me know if you need more reading material. LOL


Level Sys Troubleshoting ml31043.pdf Leveling System HWH2000_owners.pdf

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I am pretty at clumsy using this site and don't know how to send a PM to you.  Can you give me insight?

I seem to be spinning my wheels and not making any progress on troubleshooting the air system.

Once again thank you for all the info.  I have seen some of it before.  I had not seen the 2000 troubleshooting manual and have been studying it.

I am still not sure if my system is a 2000 or a 680.  The AP number on the control box is 14721.  The touch control I have does not have a button for the travel mode.  

I am going to have a look at the control box today and try to determine which system I really have. I will look to see if it has the 2000 system led's to check the operational features.






HWH control panel.jpg

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For the PM someone just click on they Profile Icon. My would be the letter "P" and you'll see a mail icon "Message". I just PM you my phone #. Before you put the touch control panel back in get the part# off the bottom of it. This is the only way to get the correct one order if you needs to.

As far as the travel mode button my is like your as soon as you release the Parking break it will automatically goes into travel mode.

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Contact Paul at AZPETE on the Irv2 forum. He works for HWH and can answer your questions. His email is pfmaddox@att.net and his phone number is 602-549-3638. He is a Commercial Member and has posted that his phone is always on, and if not answered, leave a message.

He has helped others on this forum and I am sure he can help you.

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I attempted to contact Paul a couple times and he never responded back.

Update: Just talked to Paul, so he is back on line.

Edited by Corkman
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