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

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Have no hot water flowing at all from my Atwood hot water heater. cold ok tank full?

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Hi and welcome to Fixya.

Here are 2 manuals that should help you in troubleshooting your RV hot water problem.

Multiple times there is a ref. to resetting the reset switch for 30 seconds on the unit (cover removal required)

For the ignition:

http://www.atwoodmobile.com/manuals/waterheaters/MPD%2093757%20PS%2011.19.07.pdf

For the water heater:

http://www.atwoodmobile.com/manuals/waterheaters/MPD%2093050%20PS%204.9.09.pdf

The manuals as written are full of warnings mixed in with meaningful text. (Not user friendly)

Posted on Feb 02, 2010

  • Kelly
    Kelly Feb 03, 2010

    Hi again, Correct me if I am mstaken but am I reading that you have no water flow at all? If so your probably going ot have to remove the bottom outlet fitting from the hot water tank and clear the debris blcoking the outlet hole. What happens in hot water tanks that sit for long periods it that the uppet parts of the tank where the air is break down and drop particles into the water, Those particles will gather at the tank exit point and it sounds as if your hot water tank outlet is blocked. Once you remove the fitting you can probably clear it with a philipps screwdriver. I would puge the after clearing theoutlet holas not to have wha tyou cleared clog up your kitchen sink and bathroom plumbing water faucetts or the toliet fill valve if you have that type of water closet.

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SOURCE: Intermitent heat from Atwood 10 gal marine water heater

Water level safety shutting down heat source

Posted on May 24, 2009

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Tank full of hot water,faucets deliver only cold,water trickels into tank with rapid intermittend pump action


1) Copy following link:
http://waterheatertimer.org/Crossover.html

2) Add comment with clear description of water heater, fuel type, and pump?
Is this a pump problem or water heater problem?
Is this a water well pump?
Are you getting good stream of cold water at tap?
Which water heater do you have?
Is the heater new?
Or older heater that stopped working.

Dec 27, 2012 | Atwood 10 Gallon Gas/Electric Water Heater...

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2010 view winn- the hot water faucets, when wide open the flow is very slow-light flow. The hot water heater has never been used. I have filled it and drain it, there was no trash in it. I refilled it and...


Double check that washers inside fittings attached to back of tank, are not wedged or pinched in there restricting flow. Drain tank, relieve water pressure prior, obviously. The other thing is to check that the by-pass is allowing good flow in to tank when in normal operation mode. Have seen those only go half way inside valve, but lever is at wide open setting. If all that checks out, try removing the check valve on tank, and replace it with a 1/2" galvanized pipe nipple, ( or certified plastic/nylon fitting same size) and reconnect water line direct to that, without a check valve. That should do it if nothing else was wrong. Now you have a choice, either change it or leave it out if everything seems ok, but double check that hot water isn't siphoning back to another utility such as toilet if you leave it out and toilet is close. Feeling that cold line (inlet) when water is hot should tell you. I've seen the check valve in both locations, hot (at top of tank) and cold (at bottom of tank -inlet) Not 100% sure why, right from factory that way, but I say, put it on bottom fitting if required at all. Let me know how you make out.

Oct 20, 2010 | RTO Atwood DSI-RV Water Heater-6 Gallon

1 Answer

My hot water suddenly stopped flowing. I have a good water supply, the cold is fine. The water heater is full and is hot, but, no water comes from any tap. PLEASE HELP !!!!! Dennis K.


I had the same problem and I took out the two shut off/by-pass valves (unscrewed handle and removed cartrige) to find that lime build-up had virtually sealed the lines so that no water flowed!
Cleaned out the lime deposits and reassembled valves and water flowed once again.

Sep 20, 2010 | RTO Atwood DSI-RV Water Heater-6 Gallon

2 Answers

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...


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.

Jul 16, 2010 | RTO Atwood DSI-RV Water Heater-6 Gallon

1 Answer

Cold water ok, no water flow from hot water lines.


Bypass valve incorrectly set
obstruction or dirty tank
plugged line - lime or other! does cold flow into tank ok?
Tank is split water going somewhere you can't see - this should be obvious.

There is not really anything to obstruct the flow normally so there
would have to be an obstruction somewhere. Lime, junk, garbage etc build up .
On my coach I have lots of pressure on the cold side so hot would have to have the same unless there is an obstruction into or out of the tank. If in the bypass position you have sufficient flow than the lines are ok and the problem or obstruction is in the tank itself. Drain the tank, leave the bottom plug out, open up the pressure relief valve. Turn on the water and see if you get a lot of water draining from the drain hole on the tank. There should be a lot of water coming out of the drain hole. If so that tells you that your getting sufficient flow into the hot water tank. If so your problem is the water getting out of the tank. Like a clogged return line or an obstruction from the water tank to the faucet. A dirty scale lined tank can do a number on tank water flow. Also check to see if the water is going somewhere else, your tank could be split and you just can't see where the water is going!

Dec 17, 2009 | RTO Atwood Water Heater - 6 Gal LP

1 Answer

Hot water comes out cold side for few seconds and gets cold, no hot from hot side, only cold


Make sure that the water pipes for the cold water coming in and the hot water going out are connected to the correct positions on the water heater. If the connections get reversed, the water that is supposed to be hot will be drawn from the bottom of the tank and will not be as hot as it should be. The cold water input goes to the bottom of the tank. The hot water out comes from the top of the tank.

Oct 09, 2009 | RTO Atwood DSI-RV Water Heater-6 Gallon

2 Answers

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

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

1 Answer

Hot water tank shuts down after5 minutes pilot still on water


Carefully catch some water in a container from pressure relief valve (pull lever slightly) at top of tank, and see if it's up to temperature. If it's hot there, I suspect your by-pass at back of the tank, is faulty. Depending on what by-pass system your using, it may be in wrong position, blocked, or mixing hot and cold. Cold water flows into bottom of tank, and hot out the top. If any valve in between the 2 lines, close it, and make sure valves in and out of bottom and top are open. Let me know what you find, or if water from pressure relief valve is not hot either.

Jul 12, 2009 | RTO Atwood Water Heater - 6 Gal LP

2 Answers

ATWOOD WATER HEATER


you will need to have a 115 curent for electric, run a line off the panel box, turn off water to the house drain it down, disconnect the lp gas line and cap it off, remove the water heater, install the new heater run the cold side water to the cold side {blue on the heater} the hot side to the red, take the cover plate off on the water heater run the wires, hook up the groung wire then the red and white wires to the wires comming off the panel box,, fill the water heater with water have a open faucet on the hot side, and bleed the air out, DO NOT TURN ON ELECTRIC TILL THE AIR IS OUT OF TANK AND WATER IS FLOWING THRU COMPLETELY, after you get water commming out of the faucet turn it off and turn the electric on to the water heater ,, wait about 30 min, you will have warm after an hour it will be hot and you are done,, good luck write me if you have questions, gary1121@aol.com

Jun 29, 2009 | RTO Atwood Water Heater - 6 Gal LP

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