Hot water heater too hot

GC6a-10E..

Swapped both the t-stat and eco sensors.

Removing ECO wire did not turn on any lights, and I could still hear the high pitched sound of the heater active. Removing t-stat wire did not turn on any lights, but did stop the high pitched sound.

No light comes on to indicate demand either?

Old-Biscuit wrote:
Atwood 6 gal...............?????


WHICH MODEL of Atwood 6 gal?

GC6a-10E uses on set of t-stat/eco for temp control
t-stat OPENS at 140*F (Closes at 110*F)
eco OPENS at 180*F (Closes at 150*F)----triggers FAULT Light and 'Locks Out' ALL heating

Atwood XT Model GE6EXT uses one set of t-stat/eco PLUS a mixing vlave
t-stat OPENS at 160*F (Closes 130*F)
eco OPENS at 180*F (Closes at 150*F)----triggers FAULT Light and 'Locks Out' ALL heating
MIXING Valve set for 130*F output......HOT HOT water is mixed with cold to maintain steady output



Standard model.....BOTH T-stat & ECO would have to FAIL CLOSED
XT Model....BOTH T-stat & ECO would have to FAIL CLOSED OR the Mixing Valve Cold INLET is not mixing with the HOT HOT out




To Test 'heating cycle' (either model) with water heater ON and heating ----remove a RED wire from ECO terminal....all heating should stop and fault light should come on

1. Air pocket has no bearing on hot water
2. The standard tstat is either 130 or 140, depends on the year of the Atwood. EITHER tstat, you could NOT just shower on HOT only. You would be scalded. That points to a problem prior to this problem
3. Let it continue the heat cycle and see if the ECO trips and/or the pop off valve opens. No harm if it does
4. It is very easy to install a ECO in place of the tstat. That means the temp of the water could reach 180(ECO Temp trip). I would suspect you have installed the ECO instead of the correct tstat in the tstat mount. Doug

Atwood 6 gal...............?????


WHICH MODEL of Atwood 6 gal?

GC6a-10E uses on set of t-stat/eco for temp control
t-stat OPENS at 140*F (Closes at 110*F)
eco OPENS at 180*F (Closes at 150*F)----triggers FAULT Light and 'Locks Out' ALL heating

Atwood XT Model GE6EXT uses one set of t-stat/eco PLUS a mixing vlave
t-stat OPENS at 160*F (Closes 130*F)
eco OPENS at 180*F (Closes at 150*F)----triggers FAULT Light and 'Locks Out' ALL heating
MIXING Valve set for 130*F output......HOT HOT water is mixed with cold to maintain steady output



Standard model.....BOTH T-stat & ECO would have to FAIL CLOSED
XT Model....BOTH T-stat & ECO would have to FAIL CLOSED OR the Mixing Valve Cold INLET is not mixing with the HOT HOT out




To Test 'heating cycle' (either model) with water heater ON and heating ----remove a RED wire from ECO terminal....all heating should stop and fault light should come on

Then your upper limit switch is stuck closed.

Atwood 6 gal heater, both electric and gas run without shutting off.. I havent let it go to the point that it will blow the pressure relief valve, but the water is too hot to touch, and steaming...

What brand of water heater? Suburban offers two different temp switches.