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Old 06-07-2016, 09:36 AM   #11
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Join Date: Nov 2010
Location: Northeast Louisiana
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Originally Posted by 325BH View Post
No, mine is doing something different.

If I let it run on gas (or both), it eventually faults out and shuts down. The In-Command screen says "check water heater". The water heater is shut down.

I can turn it on again and all is well... until it faults again.

I think it it getting too hot, blowing water out the safety T&P valve, and shutting down. (How the water heater is sending a problem is still a mystery to me.)

If I am using hot water while it is running it doesn't fault. Presumably because it never gets hot enough to cause a problem. Once I stop using hot water, it will fault again a few hours later. The time delay doesn't make sense either, because it gets up to temp a cycles off normally in 10 minutes or so. Only when it sits for hours does it fault and shutdown.

Electric only is no problem at all. It never faults.

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Let's see if I am following you correct. Are you saying the red light that says fault (or could be flt or even reset) beside the inside switch to the DSI/propane switch is illuminating?

If so, then this is what happens when the Direct Spark Ignitor fails to ignite the propane. The Suburban system will usually try 3 times, then go into what is called lockout mode. You have to turn the inside DSI switch fully off, then back on to reset the the DSI can once again try to light the propane.

Does this sound like your problem?

If so, there is a possibility that the water escaping the T&P valve is wetting the DSI electrode and thus it can't make the spark to ignite the propane when the thermostat calls for it too......and it goes into lockout mode. After awhile the electrode is drying out, and you manually reset the lockout with the inside switch and the DSI then can ignite the propane.....until it all happens again when the water heater is sitting without the propane burning.

Do you see the rust orange colored wire in the bottom hand right side of the pic below? This goes to your DSI electrode. Is any part of this wet from the escaping water from your T&P valve? It could even be wetting the gas control connections to the left.

You might could connect some kind of hot water hose to the T&P valve and route it below everything, so if the T&P opens the water will not get on anything electrical. Another member just did that recently and posted pics of it.


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Old 06-07-2016, 09:36 AM   #12
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Join Date: Mar 2008
Location: Concord, NC
Posts: 23,851
Originally Posted by rockfordroo View Post
...I don't know where Old Coot found 142 degree T-stats, maybe he can chime in on his part numbers.
I went out and looked and it is a 140 degree and changed the post.

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