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Old 04-01-2018, 08:51 PM   #1
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Water heater won't fire up on 2251LE

Picked up my brand new 2251LE RV. During its shakedown trip (3 days) I was unable to get the water heater to fire up on the gas setting. It would heat water on the electric (110v) side. Stove worked fine, so propane it seems it not the issue. I located the bypass valves and they are correctly turned. Got underneath, couldn't find anything amiss, there is no separate shut off valve I could find. Any ideas?

Thx Rich Guess
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Old 04-01-2018, 09:10 PM   #2
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Which company manufactured your water heater? Atwood, Suburban? ___________?
What is the model number of your water heater?

So I assume you turned on the propane water heater switch on your inside panel........? If so, did your DSI fault light come on when you flipped the switch? If so, did the fault light go out or stay on?


EDIT: If the electric side already had the water hot, the propane side has no need to fire up.
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Old 04-01-2018, 09:36 PM   #3
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The WH has a safety feature that kicks in if it fails to light several times, If the propane switch was turned on without propane, it would try a few times then lock out. It is easily reset by pulling the fuse for the WH control board. After resetting, run a burner on the stove for a minute to purge the propane lines then try WH again.
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Old 04-01-2018, 09:38 PM   #4
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Welcome to the forum its a great place to get your questions answered. X2 what Mr.Dan said about elect heating water. You can have both on at the same time run the hot water until either the gas side starts or the water get cold then you will know if or if not there is a problem.
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Old 04-01-2018, 11:16 PM   #5
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Water Heater

Thanks everybody. In the AM I will check the water heater info. The light did come on (I assume that's the light on the switch) but just stayed on.

I will run it only with propane with the 110v switch off (in fact I won't hook up to shore power, I'm home now).

I read that sometimes the lines get air in them, and running all 3 burners on the stove for a minute or 2 may help. I'll try that also.

What bugs me is obviously this should have been qa'd at the factory and the dealer. That seems to be a recurring RV complaint.
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Old 04-02-2018, 10:44 AM   #6
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My water heater is a Dometic GC6AA-10E. SN 20180202. 6 Gallon. So, I followed a suggestion about turning on the stove burners for a few minutes. I turned on the house 12v power, did not hook up to shore power, left the Electric WH switch off. Turned on the Gas WH switch, and voila, the WH fired up. Both the electric and gas switches are "lighted," i.e. they stay lit when in the on position. I'm not sure what a DSI fault light is, unless it's the light on the switch. There isn't another light on that panel that I see.

Thanks for the help!
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Old 04-02-2018, 10:54 AM   #7
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No, the DSI fault light is not the light on the switch. Sometimes the fault light is a little red LED light between the switches... sometimes it’s a light as large as an entire switch. Can you post a pic of the switch(es) to which you refer?
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Old 04-02-2018, 11:06 AM   #8
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I found a small light labeled "fault" which must be it. It's just below the lights for the tanks, propane, etc. It does not go on. Sounds like problem solved. Thx
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Old 04-02-2018, 11:35 AM   #9
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There is some really good information regarding the use and servicing of water heaters in the library section right here on the forum. You should read up on how your water heater operates, what the switches do, what the 'fault' light indicates and how to troubleshoot.

Library Link
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Old 04-02-2018, 12:10 PM   #10
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When all the great suggestions here don't solve the issue... it's time to tell the family we are doing this old school and just being thankful for water! brrrrr
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Old 04-02-2018, 03:38 PM   #11
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You can find and download the service manual for future reference. http://manuals.adventurerv.net/Atwoo...er-Service.pdf
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Old 04-02-2018, 03:54 PM   #12
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I found that mine would go through the lighting steps- you can hear if its the problem because you will hear it TICK about 4 times in a row, I had to "TRIM" the air intake on the mix tube after the orifice, by cutting down the air a bit, it would light first spark, and do it quietly, where as before it made a ruckus when the gas finally iginited. Turn the switch on and listen for the igniter..
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