coryrhonda
Minnesota
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Joined: 04/22/2007
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you need to have the igniter/flame sensor so the tip is just at the edge of the flame. If that looks good make sure the wires don't have a large amount of buildup of any sort on them. you said yours lights and I asume you have tried to get it to work a lot of times so I would think you don't have air in the lines, and you said everything else works, furnace, stove, oven. Make sure none of the spade wire connectors on the outside of the water heater are loose or corroded, a little heat can make them expand and loose contact for just a seecond and shut it down. give this a try and resond. have more things to check if that don't work. Suburban or Atwood?
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LA-BOY
sw louisiana
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Joined: 05/11/2008
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thanks for all of the useful input, I hope it is a very simple fix and it is a attwood so parts will be no problem. I will clean all of the contacts tomorrow and post a report. I just hate buying parts for anything when a easy fix is all it needed. thanks again LA-BOY
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javaseuf
Southern Cal
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Joined: 03/30/2005
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A word of caution.....
DO NOT use sand paper to clean the ingnitor or flame sensor. Use emery cloth.
Sand paper will leave silica ewsidue behind and when the flame hits that, it turns to glass and then insulates the flame sensor. It will then, not sense the flame.
Steve
2007 Springdale 291RKL
2003 F150 King Ranch
2001 Dodge Van w/Wheelchair Ramp
1991 Palomino Mustang PUP
Eureka Timberline Tent
Yamaha IF2400isc
Yamaha EF3000iSEBC
"Politically Incorrect And Proud Of It" 
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HighCover
Fort Worth
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Joined: 11/26/2006
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I just solved the exact same problem as you. This was a 1.5 year old Rockwood. It turned out to be mud-daubers built some larvae/mounds in the mixing tube. The gas would light, but the flame was erratic an went out quickly. The HWH would try again and again.
I disassembled the gas jet/tube burner outlet assembly, cleaned the mud-daubers out and it is running good as new now.
2007 Tahoe, 5.3L
Rockwood 2306
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LA-BOY
sw louisiana
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Joined: 05/11/2008
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OK, I cleaned all of the spade terminals that I could see, fired her up and it ran for about 15 minutes. Then cut off and re-lit for 5 minutes, repeated that 1 time, then it cut off and would light for about 2-5 seconds and off again. I took apart the gas/air tube and it was clean. I sprayed water down the burner tube, a little trash did come out, but not much. Put everything back together, tried to light, same thing it would light for 2-5 seconds then cut off and repeat. My gut feeling says it has something to do with the thermostat, because it ran for approx. 15-20 minutes, which is about heat up time for the tank, I think. This is a 1999 model jayco, and I have all of the original paper work but not the user manual for the hot w-tank. The pervious owner had not used it in 2-3 years. Thanks in advance for any more input. LA-BOY....
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enblethen
Moses Lake, WA USA
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Joined: 01/05/2005
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Lets look at a couple other items.
Near the thermostat and ECO is a thermal fuse. It is hidden under some white heat shrink tubing. Look closely at it. It should have good clean crimp connections.
Next look at the ECO. Look closely at connectors. You are looking for black discoloration. This would indicate a loose burnt contacts inside.
Do the same inspection on the thermostat.
Bud
Suzuki XL7 pushing Pace Arrow
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LA-BOY
sw louisiana
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I checked the fuse and it appears to be just fine, no discoloration. I did notice something new, when it lights, the spark ingn. continues to spark for 4-5 seconds even though the flame it on. Then it proceeds to cycle with on/off until I reset it. Maybe I will just take cold showers to conserve energy lol...
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enblethen
Moses Lake, WA USA
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Joined: 01/05/2005
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Did you check the four wire connector?
It could be a failing circuit board. Many RV parts repair facility can test the board.
I would suggest, if bad replacing with Dinosaur brand.
You could call Dinosaur Electronics. They are very helpful on troubleshooting. I believe they have some troubleshooting on website.
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LA-BOY
sw louisiana
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Joined: 05/11/2008
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Another question? What is the sole purpose of the ECO (electronic cut off), and what is everyone calling the flame sensor. They have one wire that sends the elect. spark from the main board to the burner, does this wire also send a signal to the main board that a flame is present. I will probably replace the thermal fuse - $ 21.99. then the eco sensor $19.99, then if all else has failed I will go to the board. I do not think the gas solenoid is bad because it does what the other electronics tell it to do, a basic open or close right????.
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enblethen
Moses Lake, WA USA
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Joined: 01/05/2005
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The ECO shuts the unit off in the event of major overheating.
If the thermal fuse looks good and has continuity, that is probably not the problem.
Check the two coils on the gas valve. The two coils must have about the same resistance. If one coil is bad then it will not operate properly.
Yes, on some the flame sensor and the ignitor is one and the same.
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