2017 171. Hot water won't stay lit.

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   If you're out of warranty and want to fix it yourself the circuit boards are about $75 on Amazon and the electrodes are $15. 
The troubleshooting guide points you at the electrode first and has some cleanup instructions. I'd suggest doing that first especially since you've already had crud in there. If that doesn't work then the next step is probably just to replace the board, as others here have suggested.
The comments on Amazon and various RV websites seem to indicate that there have been a lot of issues with these boards, some folks having replaced them more than once. There is an aftermarket board that seems like it might have a better reputation, cost is only a few $ higher.

https://www.dinosaurelectronics.com/

If it was me, I'd replace the electrode while I was in there, its only another $15 and apparently bad electrodes can sometimes kill the circuit boards. 

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offgrid Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 23 Jul 2018 Online Status: Offline Posts: 5290	Topic: 2017 171. Hot water won't stay lit. Posted: 23 Jan 2019 at 4:31am
	If you're out of warranty and want to fix it yourself the circuit boards are about $75 on Amazon and the electrodes are $15. The troubleshooting guide points you at the electrode first and has some cleanup instructions. I'd suggest doing that first especially since you've already had crud in there. If that doesn't work then the next step is probably just to replace the board, as others here have suggested. The comments on Amazon and various RV websites seem to indicate that there have been a lot of issues with these boards, some folks having replaced them more than once. There is an aftermarket board that seems like it might have a better reputation, cost is only a few $ higher. https://www.dinosaurelectronics.com/ If it was me, I'd replace the electrode while I was in there, its only another $15 and apparently bad electrodes can sometimes kill the circuit boards.
	1994 Chinook Concourse 1995 RV6A Experimental Aircraft 2015 Rpod 179 - sold

clickscrazy Members Profile Send Private Message Find Members Posts Visit Members Homepage Add to Buddy List Senior Member Joined: 09 Aug 2017 Location: FL Online Status: Offline Posts: 106	Posted: 27 Jan 2019 at 7:22am
	Pod is out of warranty, but suburban HWH is still under. Just trying to decide if its worth dealing with it or should I just buy the board. If the HWH works on electric, would the electrode still be bad?
	2018 R-Pod 171 2014 VW Touareg TDI

offgrid Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 23 Jul 2018 Online Status: Offline Posts: 5290	Posted: 27 Jan 2019 at 7:30am
	The electric and gas are completely independent systems so the electrode could be bad and have no effect on the electric side of the water heater.
	1994 Chinook Concourse 1995 RV6A Experimental Aircraft 2015 Rpod 179 - sold

GlueGuy Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 15 May 2017 Location: N. California Online Status: Offline Posts: 2702	Posted: 27 Jan 2019 at 11:25am
	There is no "electrode" for the gas part; only electric. There is a sacrificial rod to prevent electrolysis though. The sacrificial rod does not directly affect operation.
	bp 2017 R-Pod 179 Hood River 2015 Ford F150 SuperCrew 4WD 3.5L Ecoboost

offgrid Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 23 Jul 2018 Online Status: Offline Posts: 5290	Posted: 27 Jan 2019 at 12:08pm
	Yeah GlueGuy, there is. They call the DSI device an electrode. It also acts as a flame sensor. I agree that the terminology is somewhat misleading. https://www.amazon.com/Suburban-232258-2-Prong-Electrode-Assembly/dp/B003G9IYQY?ref_=fsclp_pl_dp_5
	1994 Chinook Concourse 1995 RV6A Experimental Aircraft 2015 Rpod 179 - sold

GlueGuy Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 15 May 2017 Location: N. California Online Status: Offline Posts: 2702	Posted: 27 Jan 2019 at 1:26pm
	Oh. You're (and they) calling the igniter an electrode. Sorry, not how I think about it.
	bp 2017 R-Pod 179 Hood River 2015 Ford F150 SuperCrew 4WD 3.5L Ecoboost

offgrid Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 23 Jul 2018 Online Status: Offline Posts: 5290	Posted: 27 Jan 2019 at 1:43pm
	Me either. Just trying to use the same name they are. Maybe they call it that because it also functions as a flame sensor?
	1994 Chinook Concourse 1995 RV6A Experimental Aircraft 2015 Rpod 179 - sold