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05-21-2023, 09:56 AM
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#1
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New Member
Join Date: Dec 2019
Location: Olympia
Posts: 5
M.O.C. #25453
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Water heater problems 2018 "will not light"
Good morning all, my DSI light is on in my panel. Now I only have electric heat which is not that hot for long. After advice from several people I replaced the mother board and it worked for a couple days and then off again. BTW I live full time in this so It's hard to take it in to the shop.
I have plenty of gas pressure as all other gas units work perfectly.
My fuse is good, and I hate to through money at this thing trying to guess what might be the problem.
Thanks for any help, cold showers in Washington
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05-21-2023, 10:13 AM
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#2
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Site Team
Join Date: Oct 2005
Location: Carmichael - CA
Posts: 6,778
M.O.C. #4831
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More information about the behavior would help. Does it attempt to light and fail? Can can hear the igniter clicking? Is there a smell of propane? Are there obstructions (wasp nest) in the burner tube? What more can you tell us?
In the Files section (look for the link in the thin brown ribbon above) are two manuals of the Suburban Water Heater that may help.
The Suburban Water Heater Service & Training Manual
and the Water Heater Troubleshooting - Suburban
P.S. Where in Olympia are you located?
__________________
Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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05-21-2023, 10:20 AM
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#3
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New Member
Join Date: Dec 2019
Location: Olympia
Posts: 5
M.O.C. #25453
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Morning Carl, it doesn't attempt to light, no smell or obstructions.
I'm in Nisqually.
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05-21-2023, 11:15 AM
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#4
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Montana Master
Join Date: Oct 2012
Location: Box Elder
Posts: 4,412
M.O.C. #12947
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Have you tried pushing the reset buttons on the black box that has the thermostat/Hi-limit devices? I believe the right one is for the gas mode.
__________________
Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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05-21-2023, 11:37 AM
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#5
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New Member
Join Date: Dec 2019
Location: Olympia
Posts: 5
M.O.C. #25453
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Morning Bob and Becky, yes, I have, to my knowledge I've tried everything that I can do.
But I don't yet know the "tricks of the trade" for this issue.
Thanks for responding
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05-21-2023, 12:01 PM
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#6
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Site Team
Join Date: Oct 2005
Location: Carmichael - CA
Posts: 6,778
M.O.C. #4831
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Weird! It worked after changing the motherboard and now it doesn't. I don't know anything about the motherboard. I hope it didn't suffer "infant mortality" and give up after a few usages. But AFAIK, if the gas valve solenoid doesn't click to open the valve and ignite the flame, it likely is a motherboard issue.
__________________
Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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05-21-2023, 12:34 PM
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#7
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Montana Master
Join Date: Sep 2017
Location: Florence
Posts: 945
M.O.C. #20472
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I had that happen last year, ended up replacing the thermostat limit switch.
__________________
2018 Ram 3500 MegaCab 4x4 Aisin, 4:10 Gears
Titan 50 Gal Tank, Air Lift Wireless Bags
2017 3160 RL
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05-21-2023, 12:43 PM
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#8
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Site Team
Join Date: Oct 2005
Location: Carmichael - CA
Posts: 6,778
M.O.C. #4831
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Quote:
Originally Posted by DadsHemi
I had that happen last year, ended up replacing the thermostat limit switch.
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Well that is a inexpensive thing to try.
__________________
Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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05-21-2023, 04:01 PM
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#9
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Montana Master
Join Date: Oct 2012
Location: Box Elder
Posts: 4,412
M.O.C. #12947
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This is the part for the gas side of the water heater. https://www.amazon.com/dp/B00R6KJJ3Q...2s9dHJ1ZQ&th=1
__________________
Bob & Becky
2012 3402RL
2012 Chevy 2500HD D/A CC 4WD
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05-21-2023, 04:11 PM
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#10
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Site Team
Join Date: Oct 2005
Location: Carmichael - CA
Posts: 6,778
M.O.C. #4831
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I believe you can jumper around the switch to see if the heater lights. Don't try to run it that way.
__________________
Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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05-23-2023, 07:39 AM
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#11
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Montana Master
Join Date: Dec 2017
Location: Mountain Home
Posts: 711
M.O.C. #20949
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Rather then keep buying parts that you may not need use this short PDF I put together for TS the Suburban WH in LP mode...
Have a helper turn on the WH in LP mode while you stand outside and place your fingers across those two LP solenoid valves.. If they are getting 12 vdc signal from the ignitor board you will feel both of them clunk when they open.
** Both must open or no LP will flow
** You should also already be hearing the ignitor firing when those two solenoids open
You can easily measure for 12 volts DC across the WH thermostat for the 12 volt side to verify its working before buying that part
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05-23-2023, 09:02 AM
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#12
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Montana Master
Join Date: Apr 2006
Location: Mesa az
Posts: 2,704
M.O.C. #5651
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I had a reset button assembly go bad while in Durango. Don't remember how I figured that it was the problem, but it was. Went to a local dealer and they had 1 in stock. Fixed the problem.
__________________
Tom and Gail
2013 Mountaineer 362
2012 Silverado 2500
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05-23-2023, 10:31 AM
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#13
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Site Team
Join Date: Oct 2005
Location: Carmichael - CA
Posts: 6,778
M.O.C. #4831
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Quote:
Originally Posted by ChuckS
Rather then keep buying parts that you may not need use this short PDF I put together for TS the Suburban WH in LP mode...
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Thanks Chuck! That is a great diagnostic aid. I have added it to the File section for future reference.
__________________
Carl (n Susan)
There is more to life than fuel mileage.
2012 Montana 3700RL Big Sky Package towed by a 2015 Ford F350 6.7L PSD 4WD CC LWB
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05-25-2023, 02:13 PM
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#14
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Montana Master
Join Date: Nov 2004
Location: Oak Harbor
Posts: 1,521
M.O.C. #2471
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Good afternoon,
IF the water heater won't run on gas the problem is more than likely one of these 2 solenoids: https://www.amazon.com/Suburban-5210...%2C155&sr=8-53 They are located behind the gas valve and control the flow of gas to ignite the water heater. I have had them go bad on me and other MOC members rigs. I carry spares with me now because I have found they will go out at the most inoportune time. I have included some pictures of where they are located. It is a pretty simple fix, but requires a bit or disassembly. I would replace both of them to be on the safe side.
Jack 
__________________
Previous:2004 Mountaineer 325FKBS,2010 Montana 3455SA Now:2018 Bighorn 3575EL (SOB's  ) Res. Fridge,W/D,Disc Brakes,Water Softener,Dish Tailgater PRO,LioN Batts, several mods.
2021 RAM 3500 Laramie.... "LOADED", 4x4, SB H.O. 6.7L, Aisin Trans, PullRite Super Glide Hitch, 52 Gallon Titan Fuel Tank.
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05-26-2023, 12:27 PM
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#15
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Established Member
Join Date: Jun 2019
Location: Fruitland park
Posts: 13
M.O.C. #24308
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Thermal couple won't let heater light if it is bad. Very easy to replce
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