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Old 04-17-2019, 07:06 AM   #1
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Atwood GE16 EXT -overheating?

Water is leaking out of the pressure relief valve. See attached photo (sorry its sideways). How could I find the fault - valve, thermostat, or motherboard?

Based on the amps the coach is using, it heating element does not appear to be turning off. I have not tried gas only.

(2011 Fleetwood Expedition 38B - 10 gallon tank).
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Old 04-17-2019, 07:24 AM   #2
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Water sometimes will drip from the pressure valve even though there is no problem. Water expands when heated. Most times just using the hot water will stop the leaking.
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Old 04-17-2019, 07:54 AM   #3
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Quote:
Originally Posted by Fulltimer View Post
Water sometimes will drip from the pressure valve even though there is no problem. Water expands when heated. Most times just using the hot water will stop the leaking.
You want to make sure there is an 'air gap' in the tank as explained in the Atwood HWH service manual page 26;
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Old 04-17-2019, 08:10 AM   #4
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Yep, reestablish the air cushion and the weaping should stop.
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Old 04-17-2019, 12:10 PM   #5
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I did the air gap procedure and waited. And its still leaking. I should make it clear that its not dripping, its full on leaking out the valve.

I do not have a temp gun here with me, but it sure looks to be boiling. I decided NOT to do the touch test to confirm.

My guess is the heating element is not cycling off.

And again, sorry for the sideways pic.
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Old 04-17-2019, 12:31 PM   #6
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Water RUNNING out like that is most likely due to a bad or crudded up T&P Relief Valve
Turn water heater ON.....wait 20 minutes and then collect some of that water in a Glass and measure the temp with a thermometer







The 'XT' Models use a high temp normal t-stat to control heating cycles
That t-stat should OPEN at 155*F to stop electric and/or propane heating.
That t-stat should CLOSE at 125*F to allow reheating cycles.
(Mixing valve on backside of WH Tank is set for 130*F output to RV Hot water system)


The ECO (Energy Cut Off----High temp t-stat) should OPEN at 180*F to shut down ALL heating......triggers RED Fault Light and locks out circuit board.
When water temp drops to 150*F the ECO will Close and the lock out can be reset by turning switch off/on ---Red Fault light goes out


T&P Relief Valve OPENS at 210*F/150 PSI and will spew hot water/steam



Check and make sure the T-stat and ECO are being held TIGHT against tank wall.
If not...requires higher temps to open them due to lack of good contact


'Weeping' (slow drips) is typically due to loss of 'air gap'
LEAKING could be from calcium/crud built up on valve seat/disc so it is not closing properly.
With water supply ON, water temp COOL----hold open T&P via lever and let it BLOW
Then let go of lever and let valve SNAP closed---repeat a few times.



For T&P to actuate the 'Normal' Temp T-stat AND the ECO T-stat would have to FAIL to allow excessive heating of water to occur.
Otherwise T&P is crudded up or needs replaced **Standard 3/4" NPT T&P Relief Valve used on water heaters----any hardware store.







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Old 04-19-2019, 01:03 PM   #7
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OP.........


Find the problem-----bad T&P ??


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Old 04-22-2019, 06:47 AM   #8
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Well... Its fixed, or maybe better said - its now working correctly.

I let it cool, did the air purge procedure, flipped the T&P valve a bunch of times and also unplugged and reattached all electrical fittings. Then when I turned it back on, it was still leaking. So i took a shower. After showering, its now working correctly - no leaks.

So I cannot tell what exactly I did to fix the problem. Hope it doesn't happen again!
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