GE16EXT Water Heater Issue

[Major8]

I have a GE16EXT water heater in a Discovery. It heats water fine in either mode. However, in both modes, it seems to heat to access and then goes into fault mode. I am think a new thermostat but wondering if anyone has experienced this issue. Thanks in advance for your help!

[Old-Biscuit]

Atwood GE16EXT water heater is a 10 gal tank that uses a HIGHER temp T-stat (160*F) and a Mixing Valve set for 130*F output into hot water plumbing lines
*10 gal normal t-stat is 140*F

Both Gas & Electric are controlled by same 160*F t-stat/130*F Mixing Valve

Both on at same time results in fastest recovery time but 160*F t-stat should still open/control temp

IF ECO is tripping/locking out operation/triggering Fault light then T-stat is NOT opening soon enough.
ECO (energy cut off---High temp t-stat) trips at 180*f

If ECO is opening...time for new set T-stat & ECO

Atwood 91547 (EXT set of t-stat/ECO)

[Gary RVRoamer]

By "goes into fault mode", do you mean the ECO opens, or something else? Old Biscuit explained about the ECO, but not clear that is what you meant.

[Major8]

Originally Posted by Gary RVRoamer

By "goes into fault mode", do you mean the ECO opens, or something else? Old Biscuit explained about the ECO, but not clear that is what you meant.

I am referring to the red fault light coming on and heating stops. I can shut the heater off and when the water cools, it will start heating again. System always heats until it faults. I have not tested the temp but it feels very hot

I ordered the T-stat and ECO kit. This seems like the 1st step.

Thank you all for the input