Grizzly128
N. Dakota
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Joined: 01/05/2007
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One of our neighbor snow bird friends just pulled in today, so good to see them again. They are sporting a beautiful new Grand Junction 5th wheel.
In discussing problems he mentioned the water heater (works fine on elec.) makes the 3 tries to light then goes into reset mode. Sounds like there is ignition and gas present but burns for a short time then quits.
I know I should have more info ie make, model, etc...but just thought someone might know of some common cause we could look at..on old furnaces and residential heaters we would be looking at thermo couplers.....any/all suggestions much appreciated
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FalconLover
Southern California (Whittier)
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Joined: 07/28/2005
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One possible problem is the air/fuel ratio. There should be a tube surrounding the burner that's about 1/2 to 3/4" diameter and maybe a couple inches long. They're usually right up front and down low. It should have a sliding adjustment or variable opening vent hole in it for better lack of describing it.
Try opening up or closing off the gap and starting it up again. They sometimes vibrate open or closed and throws off the adjustment. A little makes a big difference so make small adjustments and keep trying.
Good luck! 
John
The Rutters
2004 Ford F350 Crewcab Lariat FX4 (4x4) DRW
6.0 PSD, Torque Shift, Jack Rabbit roll top cover, Rosen widescreen DVD system
2004 Montana Mountaineer 33' fifth wheel (297RKS) w/double sofa option
1965 Ford Falcon Futura (Pro Street/Driver)
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Alpenliter
Fulltimer: Wherever we are!
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Joined: 04/10/2005
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Try running a brush through the mixing tube. Something as small as a spider web can cause problems.
My first Wife Linda, 45+years
2004 F-450 CC, DRW 6.0 Classy Chassis Upgrade
Bulletproof Diesel upgrades
1997 33' Alpenlite
400 Watts Solar
Lifetime Good Sam Member #39644174
Escapees SKP#89882
Vietnam Vet '67-'68
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Old-Biscuit
Across the USA
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Joined: 06/20/2009
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Gas and Spark....lockout:
Poor ground connection
Electrodes out of flame pattern
Dirty electrode
Partial obstruction in main burner tube
Partially obstructed main burner orifice (remove and clean with isopropyl alcohol)
Improper air adjustment (should be 1/4 open)
Low voltage (10.5VDC Min)
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