Question about RTO Atwood DSI-RV Water Heater-6 Gallon

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MY Atwood 6 gallon water heater will start heating the water. I turn on the water and it is hot for about 2 minutes and then is cold. The water heater does not turn back on. I waited a couple days and checked the heater again and it repeated the same thing. Heated water, ran for about 2 minutes then stopped.

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I have an Atwood GCA6AA Combination 110VAC/LP gas w/ electronic ignition. Manufactured 5/13/08. It was operated without being full of water. The 110V still heats but the gas operation appears to be locked out. I have 12VDC at the control panel. I have jumpered the thermal cut-off to no avail. I have 12VDC to the circuit board thru the BRN 3 wire. Is there a way to reset the ECO switch? Is the pricey circuit board the next step.?

Thanks,
Joel

Posted on Jul 22, 2010

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Try opening the pressure relief valve (carefully so you don't burn yourself) slightly, and see if water comes out and if it is hot. It sounds like you may have very little if any water in there. Check by-pass valves at back of water heater for proper positioning. Cold should go in the bottom, hot out the top. Make sure there is flow through any valves going into bottom, and any valve at the top.Any valves connected in between the hot and cold should be in the off position. If need be, to test if incoming cold water getting into tank at bottom fitting, shut off water, relieve pressure in system by opening taps until all pressure is gone. then close all taps. Now remove your drain plug, then turn water back on, and water should shoot out the drain plug hole with good pressure within a few seconds and flow steady while water on. If not you have a restriction such as valve in wrong position or faulty, so try moving valve to get better flow out drain plug. If flow out drain is good, then make sure valve at top fitting on back of tank (if any) is also open for good flow . Any other valves should be closed in between those 2 lines. Let me know what you find.

Posted on Jul 20, 2010

  • Mike Butler
    Mike Butler Jul 22, 2010

    Use a jumper at eco as well to see if it's at fault. Just pull female spades off eco and add a jumper end to each, or short wire with 2 male spades to by-pass it FOR TEST PURPOSES ONLY. If it works, just pick up a new ECO. Some have reset in center.

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1 Answer

I need to flush my Atwood L/P Gas water heater MPD 93756 I'm unable to locate where you add the vinegar. Can you advise!


Remove hot pipe connection, and flush out through drain valve.
Or remove TP valve and flush out through drain valve.
Connect small circulating pump to 5 gallon bucket with 2 gallons white vinegar like they do with tankless water heater, as shown following Bosch manual. And let run for 45 minutes.
http://waterheatertimer.org/pdf/Bosch_Descaling-heat-exchanger.pdf
White vinegar is safe for humans.

If odor is the problem, use H2O2 hydrogen peroxide, and not bleach. Hydrogen peroxide is safe for humans and easy to flush out of water heater and pipes. While it can take weeks to get rid of bleach, which is caustic and toxic.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/gene_9f0ef4df2f9897e7

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Have a 2005 coach w/Atwood DSI-RV 6 gal water heater. Gas lights, heater fires and gets hot, but doesn't transfer the hot water through the lines to the sink faucets. jwmystery@aol.com


You need to check by-pass valve(s) on back of tank for proper position. You need cold open going in to bottom tank fitting, and hot open at top. If any valves in between those 2 lines via "T"'s, turn them to off position.

Oct 29, 2010 | RTO Atwood DSI-RV Water Heater-6 Gallon

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When gas switch on an atwood water heater is turned on, the electric switch blinked and unit doesn't light


It usually only lights when starting up on propane, or if it didn't ignite for one reason or another. Usually light off indicates working o.k. Are you sure the electric element hasn't been on and water is heated already? Carefully open pressure relief valve slightly and see if water is hot or cold.

Jul 11, 2010 | RTO Atwood DSI-RV Water Heater-6 Gallon

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I have a 1994 pop up with an Atwood water heater. I hear the water heater turn on when plugged in but no hot water.


Have you checked your by-pass at rear of water heater to make sure it's in proper position? If it's still in bypass, you will only get cold water from either tap. Cold water goes in bottom, and hot comes out top. Any valves in between those 2 lines need to be off. Let me know what you find, as they use a few different ways to do the by-pass.

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Water heater doesn't keep running


Sounds like youo have a problematic gas valve. But I would get a gasfitter to replace it. Not for the amatuer.

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RV water heater problem: my water heater ignities, when I turn on the hot water faucet there is a steady flow of water but no hot water. The bypass valve is parallel with the cold water line. I can only...


The first question is this
From the outside of your RV is the water heater square or is it longer than it is tall?

If it is square it is a Suburban
If it is longer than it is tall then it is an Atwood
Forest River mostly uses Suburban

How long do you let the unit burn/run before you try the hot water? From a cold start it will take - depending on the outdoor temp. & the gallon size of your water heater, 15 to 30 minutes for the water to get hot.

If you have waited this long then I would suspect the bypass valve is in the wrong position

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2 Answers

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You have a cracked dip tube. Part at hd is under 10 dollars. Remove and replace via cold water inlet side top of water heater. Degree of labor skill 1-10 = 8.

Please Rate.

Apr 04, 2009 | RTO Atwood Water Heater - 6 Gal LP

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