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Old 01-04-2015, 02:30 PM   #1
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Water Heater Overheating

Does anyone have any other checks before I buy new control board? Both electric and gas works but the continues to heat up and the relief valve activates. I have replaced thermostat and ECO plus relay same issues. I remember lights would come on the control board but have none now. Model is Atwood 6 gallon combo.
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Old 01-04-2015, 04:54 PM   #2
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Mine does the same. Water out of the relief and the unit is still heating. Have not looked into it yet. Is there any heat sink compound or a bonding agent at the thermostat to tank connection?
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Old 01-05-2015, 11:25 AM   #3
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Water Heater

None but I may try that
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Old 01-05-2015, 11:27 AM   #4
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Sometimes you just need to burp the water heater. Open a faucet on hot and let out the air and hot water. If my relief valve drips, this is what I do and it stops. Your problem may be completely different, but its something to try.
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Old 01-05-2015, 12:48 PM   #5
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Originally Posted by jlomas360 View Post
Does anyone have any other checks before I buy new control board? Both electric and gas works but the continues to heat up and the relief valve activates. I have replaced thermostat and ECO plus relay same issues. I remember lights would come on the control board but have none now. Model is Atwood 6 gallon combo.

I would be interested to hear what the solution is to the problem.
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Old 01-05-2015, 02:07 PM   #6
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None but I may try that
The tanks are stamped and I bet the contact is not good between the two. In the hvac world I know they have a heat transfer paste used for thermostat connections in ac units.
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Old 01-05-2015, 03:17 PM   #7
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What temp is the water? Mine doesn't have a thermostat so is factory controlled at 140. I know some Relief valves can go bad and cause a drip/leak. Mine used to leak and replaced the relief valve which cured the issue.
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Old 01-05-2015, 04:09 PM   #8
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Also make sure there is no air in the tank.
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Old 01-06-2015, 05:54 AM   #9
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Sometimes you just need to burp the water heater. Open a faucet on hot and let out the air and hot water. If my relief valve drips, this is what I do and it stops. Your problem may be completely different, but its something to try.
X2..
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Old 01-06-2015, 07:29 AM   #10
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good point...
our last 5er had the on demand hot water system and air anywhere in the system would fool it and it would either cool or heat too much ...
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