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06-16-2009, 07:08 PM
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#1
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Senior Member
Join Date: Sep 2006
Location: Pennsylvania
Posts: 545
SUN #67
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Water Heater
After limping through the M&G with a malfunctioning water heater, I spent the afternoon buying new parts. Tomorrow I'll replace everything and hope they fix the problem. The only thing left that could be the problem is the circuit board, that cost $180. The dealer wants $110 an hour for labor, so I can replace a lot of parts and still come out ahead.
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Mike & Roz
2018 Grand Design 315RLTS
2023 Ford F-350 Lariat PSD/CC/LB/FX4
Sunlines= '06-2075, '06-264SR
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06-16-2009, 07:29 PM
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#2
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Moderator
Join Date: Dec 2006
Location: Michigan
Posts: 6,155
SUN #123
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Yeah Mike, the circuit board is a really simple job, easily done by you. I'd say it's most likely the problem too. The things are so electronically controlled that whenever something goes wrong and it isn't spiders, it's most likely the board. We had to replace two within the past year; one never used, one five years old with quite a bit of use.
Jon
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2007 T-286SR Cherry/Granola, #6236, original owner, current mileage: 9473.8 (as of 6/18/21)
1997 T-2653 Blue Denim, #5471
1979 12 1/2' MC, Beige & Avocado, #4639
Past Sunlines: '97 T-2653 #5089, '94 T-2251, '86 T-1550, '94 T-2363, '98 T-270SR
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06-16-2009, 07:54 PM
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#3
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Senior Member
Join Date: Jun 2007
Location: New Hampshire
Posts: 1,025
SUN #292
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Before
Before replacing a circuit board i'd one by one remove the connectors and reseat them, possibly putting a little conductive grease on them, available at Home Depot or Lowes used for aluminum/cooper connections.
I have had two situations where simply ungluging and reconnecting has fixed circuit board problems. It was the connections not the board. It could save you some money.
A circuit board has never failed in our bounder, a2 years but the connections have failed and frequently it's just a case of reseating the contacts.
Norm Millaird
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06-16-2009, 08:32 PM
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#4
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Moderator
Join Date: Dec 2006
Location: Michigan
Posts: 6,155
SUN #123
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I forgot to mention that when you do go to get a new board, take the old one with you. They should have a piece of equipment supplied by Atwood designed to test the circuit boards to see if they are faulty. This will determine if you really need a new one or not. Testing this will also prove if you should do any further investigation for a problem.
Jon
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2007 T-286SR Cherry/Granola, #6236, original owner, current mileage: 9473.8 (as of 6/18/21)
1997 T-2653 Blue Denim, #5471
1979 12 1/2' MC, Beige & Avocado, #4639
Past Sunlines: '97 T-2653 #5089, '94 T-2251, '86 T-1550, '94 T-2363, '98 T-270SR
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06-17-2009, 05:45 AM
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#5
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Senior Member
Join Date: Sep 2006
Location: Pennsylvania
Posts: 545
SUN #67
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Jon
Yes I talked to the tech and they have the equipment to test the circuit board. He said the board has no control over the thermostat, so he thinks the thermostat isn't working. As for the gas not staying lit, it could be the board not sensing the flame, but a very good chance the electrode isn't sending a signal back to the board.
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Mike & Roz
2018 Grand Design 315RLTS
2023 Ford F-350 Lariat PSD/CC/LB/FX4
Sunlines= '06-2075, '06-264SR
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06-17-2009, 02:39 PM
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#6
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Senior Member
Join Date: Sep 2006
Location: Pennsylvania
Posts: 545
SUN #67
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Well put the parts in and it fired right up. I think what happened was the thermostat went bad, letting the water over heat, which opened the pressure/temperature relief valve, spraying water on the electrode causing it to short out. So for less than $50 I have a new electrode, thermostat, and E.C.O.. While I was at it, I put a new nylon nipple in to hook the drain hose to. The one that I put in before the M&G was supposed to be for hot water but it melted and blew out. And I also put a fitting in the relief valve with some hose so water can't spray on all the controls if it ever releases water again.
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Mike & Roz
2018 Grand Design 315RLTS
2023 Ford F-350 Lariat PSD/CC/LB/FX4
Sunlines= '06-2075, '06-264SR
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06-17-2009, 02:44 PM
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#7
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Senior Member
Join Date: Jun 2007
Location: Pennsylvania
Posts: 312
SUN #307
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Mike,
Glad to here all repaired well. It's wierd how one thing leads to another in the cause and effect world. How much do you think it would have cost to let the dealer figure it out. I bet a lot more than 50 bucks. Take Care and hope to see you all soon..............Marshall & Sue
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Marshall & Sue
2007 T-195SR (Lucky)
1980 Sunspots (Peanut,Pigpen & Penelope)
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06-17-2009, 08:59 PM
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#8
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Moderator
Join Date: Nov 2006
Location: Ohio
Posts: 12,643
SUN #89
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Mike
Glad it turned out good. And learned a few things too. The flame sensing, that one is odd. Would be real interested if you had an ohm meter to measure the old and new to tell what works and what does not.
Thanks for reporting back
John
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Current Sunlines: 2004 T310SR, 2004 T1950, 2004 T2475, 2007 T2499, 2004 T317SR
Prior Sunlines: 2004 T2499 - Fern Blue
2005 Ford F350 Lariat, 6.8L V10 W/ 4.10 rear axle, CC, Short Bed, SRW. Reese HP trunnion bar hitch W/ HP DC
Google Custom Search For Sunline Owners Club
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06-18-2009, 07:22 AM
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#9
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Senior Member
Join Date: Sep 2006
Location: Pennsylvania
Posts: 545
SUN #67
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JohnB
I could test them and see if there is any difference. But from the way I understand it, the return voltage after sensing the flame is so small that you would need specialized equipment to measure it. Something like 400/millionth of a volt. So even though it will spark, the return voltage is so small that even a crack in the porcelain that you can't see with your eyes can disrupt that signal. Don't know if all the facts are true, but replacing the electrode did the trick.
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Mike & Roz
2018 Grand Design 315RLTS
2023 Ford F-350 Lariat PSD/CC/LB/FX4
Sunlines= '06-2075, '06-264SR
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