My neighbor was filling up her black tank to flush it and forgot to open drain and flooded her trailer. When this happened, her Atwood hot water tank over heated and pressure relief valve opened and drained tank. She shut off power to tank and later refilled and turned it back on. In 12 minutes relief valve opened up and drained. What is causing tank to over heat and how to correct this ?She has a SunnyBrook 5th wheel

M.R.E. wrote:My neighbor was filling up her black tank to flush it and forgot to open drain and flooded her trailer. When this happened, her Atwood hot water tank over heated and pressure relief valve opened and drained tank. She shut off power to tank and later refilled and turned it back on. In 12 minutes relief valve opened up and drained. What is causing tank to over heat and how to correct this ?She has a SunnyBrook 5th wheelAn Insurance claim is in order! Possibly totaled.

M.R.E. wrote:My neighbor was filling up her black tank to flush it and forgot to open drain and flooded her trailer. When this happened, her Atwood hot water tank over heated and pressure relief valve opened and drained tank. She shut off power to tank and later refilled and turned it back on. In 12 minutes relief valve opened up and drained. What is causing tank to over heat and how to correct this ?She has a SunnyBrook 5th wheelWater was connected to black tank flush so NO water was supplying RV Plumbing System and Water Heater was left ON...The t-stats failed allowing it to overheat and T&P Relief Valve OPEN to relieve the pressure built up from overheat the water.What Atwood WH Model does she have? Electric and Propane?Older then 2004 year or newer then 2004 year?What heat source was she using?

She has a '06 SunnyBrook . Atwood model #GC10A-4E. She was using electric power.

She wasn't using black tank flush, Just had a weight on pedal.

M.R.E. wrote:She has a '06 SunnyBrook . Atwood model #GC10A-4E. She was using electric power. M.R.E. wrote:She wasn't using black tank flush, Just had a weight on pedal.So no hot water was flowing.....all flow was via cold water line to toilet Water heater GC10A-4E uses ONE set of t-stat/ECO to control heating for both electric and propane*T-stat SHOULD have stopped all heating when water temp reached 140*F*ECO (Energy Cut Off/HI Temp) SHOULD have shut down ALL heating when water temp reached 180*F and 'locked it out' plus triggered RED Fault Light*T&P Relief Valve OPENS when water temp reaches 210*F and/or 150 PSINow did the T&P OPEN or just WEEP?Both t-stat & ECO would need to fail in the CLOSED position for continued heating.......RARE. Typically those preset snap disc t-stats fail OPEN....no heatingDid she have the RED Fault Light? and have to Reset ON/OFF for it to heat again?IF T&P Popped Open and spewed water/steam then need to replace t-stat/ECO---come as a set

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Old-Biscuit
Explorer III
Mar 31, 2018
M.R.E. wrote:
My neighbor was filling up her black tank to flush it and forgot to open drain and flooded her trailer. When this happened, her Atwood hot water tank over heated and pressure relief valve opened and drained tank. She shut off power to tank and later refilled and turned it back on. In 12 minutes relief valve opened up and drained.
What is causing tank to over heat and how to correct this ?
She has a SunnyBrook 5th wheel

Water was connected to black tank flush so NO water was supplying RV Plumbing System and Water Heater was left ON...

The t-stats failed allowing it to overheat and T&P Relief Valve OPEN to relieve the pressure built up from overheat the water.

What Atwood WH Model does she have?
Electric and Propane?
Older then 2004 year or newer then 2004 year?

What heat source was she using?
Cummins12V98
Explorer III
Mar 31, 2018
M.R.E. wrote:
My neighbor was filling up her black tank to flush it and forgot to open drain and flooded her trailer. When this happened, her Atwood hot water tank over heated and pressure relief valve opened and drained tank. She shut off power to tank and later refilled and turned it back on. In 12 minutes relief valve opened up and drained.
What is causing tank to over heat and how to correct this ?
She has a SunnyBrook 5th wheel

An Insurance claim is in order! Possibly totaled.

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