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Old 11-05-2023, 05:58 PM   #1
Mini-Skoolie
 
Join Date: Aug 2023
Posts: 19
SW6D water heater install wiring/ lighting issue

Hello! Water Heater trouble shooting!

We have a new Suburban SW6D water heater installed in our skoolie and have never gotten it to light. the ignitor sparks but it seems like no propane is getting to it (our propane system works great for our stove/range and it doesnt seem to be a leak as our leak alarm doesn't go off either when trying to light the water heater). So my guess is its something electrical not opening the solenoids to the water heater.

WE did just try replacing the solenoid switches as I read thats a common problem, but that didn't change anything.

Attached are some pictures of out wiring, which is where I think we went wrong, but maybe someone has some knowledge on it

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Sshiluk is offline   Reply With Quote
Old 11-05-2023, 06:09 PM   #2
Bus Geek
 
Join Date: Sep 2018
Posts: 2,831
Year: 2007
Coachwork: Thomas Built
Chassis: Minotour
Engine: Chevy Express 3500 6.6l
Do you have the toggle switch for it?

I have the same water heater. It works great.

First thing I’d do is remove power from the unit, go hit the reset switch that’s under a rubber boot on the front of the tank then turn it back on.

I recall the wiring diagram is confusing. Let me pull up some info and see if I can help
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Old 11-05-2023, 06:47 PM   #3
Bus Geek
 
Join Date: Sep 2018
Posts: 2,831
Year: 2007
Coachwork: Thomas Built
Chassis: Minotour
Engine: Chevy Express 3500 6.6l
I didn’t dig down to the circuit board, but I looked at what I did and I actually used some color coding tape on the wiring that I did.

Red goes to the toggle switch. The other side of that switch goes to positive.

I have Blue and a negative wire both going to the LED. I think they’re reversed That light has never worked and that explains why.

The white and green shown in the photo are tied together at the negative side of the fuse block.

So mine works, but I believe the LED is wired in reverse which would explain why the LED doesn’t light.
Attached Thumbnails
41F8BB1C-D02B-49C1-B514-5746464E2D9F.jpg  
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Old 11-05-2023, 06:48 PM   #4
Mini-Skoolie
 
Join Date: Aug 2023
Posts: 19
We have it hooked up to a normal 12v toggle switch for power(one of these three our lights are on the other 2):
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

And the propane on/off connected to the solenoid on the propane tank is attached to:
https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

Do you think that might be the issue?
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Old 11-05-2023, 06:51 PM   #5
Mini-Skoolie
 
Join Date: Aug 2023
Posts: 19
Should we buy this switch instead and see if it works, or do you think the current switches are okay and its something else?

https://www.amazon.com/gp/product/B0...KIKX0DER&psc=1
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Old 11-05-2023, 06:56 PM   #6
Bus Geek
 
Join Date: Sep 2018
Posts: 2,831
Year: 2007
Coachwork: Thomas Built
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Engine: Chevy Express 3500 6.6l
How did you switch the gas valve? I didn’t do that.
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Old 11-05-2023, 07:00 PM   #7
Bus Geek
 
Join Date: Sep 2018
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Year: 2007
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Engine: Chevy Express 3500 6.6l
Just to be clear in the photo:

Green: Neg to the fuse block.
Blue: ? Straight through I guess
Red: Pos to the Junction box
Black: Pos at the fuse block
White: Neg at the fuse block
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Old 11-05-2023, 07:38 PM   #8
Bus Geek
 
Join Date: Sep 2018
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Year: 2007
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Engine: Chevy Express 3500 6.6l
Quote:
Originally Posted by Sshiluk View Post
And the propane on/off connected to the solenoid on the propane tank is attached to:

https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1

Do you think that might be the issue?

Are you saying that you have an electronic solenoid that turns on the gas at the tank?

I think this might be the problem. How is this wired? I’m just letting the control board operate the solenoid on the water heater.

If your gas is working for other appliances then maybe it’s not the problem.
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Old 11-05-2023, 08:11 PM   #9
Bus Crazy
 
Join Date: Jun 2016
Location: Orange County, CA
Posts: 1,374
Year: 1990
Coachwork: Crown, integral. (With 2kW of tiltable solar)
Chassis: Crown Supercoach II (rear engine)
Engine: Detroit 6V92TAC, DDEC 2, Jake brake, Allison HT740
Rated Cap: 37,400 lbs GVWR
I'm extremely wary of Chinese switches. Many of the Chinese switches I've ever bought have failed, some almost immediately, some after a few years, but their failure rate is completely unacceptable to me. I've now replaced every Chinese switch in my bus with Carling or Blue Sea switches, with zero resultant failures.

And PLEASE don't buy from Amazon. Screw Jeff Bezos!

John
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Old 11-05-2023, 09:09 PM   #10
Bus Geek
 
Join Date: Sep 2018
Posts: 2,831
Year: 2007
Coachwork: Thomas Built
Chassis: Minotour
Engine: Chevy Express 3500 6.6l
Quote:
Originally Posted by Iceni John View Post
And PLEASE don't buy from Amazon. Screw Jeff Bezos!

John
Thank you. I deleted my Amazon account a dozen years ago and never looked back
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Old 11-09-2023, 02:56 PM   #11
Mini-Skoolie
 
Join Date: Aug 2023
Posts: 19
Yeah I have a master solenoid outside the bus at the tank (for extra safety, so when propane isn't in use we can shut it off outside of the bus without having to crawl under and manually shut it off). It hasn't effected out other propane appliance, it works fine, so I dont think thats the issue
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Old 11-09-2023, 03:26 PM   #12
Bus Geek
 
Join Date: Sep 2018
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Year: 2007
Coachwork: Thomas Built
Chassis: Minotour
Engine: Chevy Express 3500 6.6l
Can you describe how it’s wired?
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