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

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I have a 6 gallon Atwood water heater, model GCH6-7E, DSI, heater lights off on gas when swithch is placed to on position. Heats water very hot , but when switch is put in off position, flame is reduced by 95%, residue gal and flame remains. I suspect gas control valve.

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Mike Butler

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  • RTO Master
  • 6,674 Answers

Your on right track. When this happens and small flame still there, pull wire(s) off at gas valve, or test for voltage from ECO to gas valve. No voltage, then there should be no gas. Change gas valve.

Posted on Oct 20, 2010

Testimonial: "Changed the gas valve, now heater works as it should, No fumes and no flame after shutoff."

  • 2 more comments 
  • Ben Southgate Jan 05, 2011

    how do you change the valve? thanks Ben ([email protected])

  • Mike Butler
    Mike Butler Jan 06, 2011

    What is your model number? (I'm assuming this is a different person asking question ) Look at tag on inside behind cover.

  • Ben Southgate Jan 06, 2011

    Its an Atwood 6 Gallon G6A-7. The model number on the gas control is MPD-91403
    My pilot wont stay lit, but looks strong, I've changed the thermocouple but still the same problem. It goes out once the button is released.
    thanks

  • Mike Butler
    Mike Butler Jan 07, 2011

    Make sure flame is good under thermocouple probe so that it gets proper sensing of flame, and if that's o.k., before you change gas control, remove thermocouple fitting where it attaches to gas control and spray wd-40 in the hole and twirl up some steel wool and push it in the hole and twirl it to try and clean the surface inside there as well. Then spray it out with WD-40 once more to flush out shavings etc, and if you have compressed air, blow it out as well. Now re-attach fitting and snug it, then re-try pilot again. If it works, great if not replace gas control. Let me know the results. You do realize that it should be a certified technician who changes that gas control if necessary, correct?

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Atwood water heater


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May 13, 2013 | RTO Atwood DSI-RV Water Heater-6 Gallon

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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. [email protected]


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

1 Answer

I have a Atwood 10 gallon electric/ propane water heater on the Hornet travel trailer I purchased used. There are two switches on the wall, one is an on/off switch that lights up and the oither is just an...


The two switches control the water heater either in the gas or electric mode. The switch with the lights would be for the gas operation, and the switch without lights would be for the electric mode. Prior to operating either switch, make sure the water tank is full of water. Turn your hot water tap on, if water comes out, tank is full. Connect trailer to 110 Volt source, turn circuit breakers on, Place switch without lights to on position. If water does not heat in 45 minutes, Install new heat proble. The gas mode should be repaired by someone that is familiar with that system. Atwood can provide you with a local service center.

Oct 10, 2010 | RTO Atwood DSI-RV Water Heater-6 Gallon

1 Answer

Atwood 10 gallon H2O heater- replaced thermal couple and electrode spark and sensor but heater comes on with switch, heats water for 10 to 15 mins then burner goes out. Can hear a couple of switching...


I'd check that ECO and thermostat discs are making contact properly with tank.Just peel back foam cover on outside of tank that has ECO and THERM marked on it. If they are installed correctly, replace them.

Aug 06, 2010 | RTO Atwood DSI-RV Water Heater-6 Gallon

1 Answer

I have atwood pilot relight model gc6aa-8 pilot will light but after tank heats up & there is no call for hot water,pilot is out and very hard sometimes impossible to relight.


So are you saying that the first initial lighting of the pilot, without turning to on, works o.k., good flame etc, ? If not sure, try lighting pilot only, and leave setting at pilot only, and see if it's a good flame, and get back to me.

May 25, 2010 | RTO Atwood DSI-RV Water Heater-6 Gallon

1 Answer

My rv water heater ignites, I have a steady flow of water in the sinks from the hot water spicket, but no hot water. The bypass valve is positioned paralllel to the cold water valve. I am not sure of the...


If your lighting and not getting hot water then you have a valve closed or your by pass is in the wrong position, if it is burning on gas it will heat water

Sep 06, 2009 | RTO Atwood DSI-RV Water Heater-6 Gallon

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