RV water heaters use 2 t-stats
One is the 'normal' temp t-stat. It is what allows heating & reheating (after cool down) of water.
Suburban uses 130*F fixed temp t-stat
Atwood uses 140*F fixed temp t-stat
Other one is the ECO (Energy Cut Off) t-stat (High temp shut down). If normal t-stat should fail the ECO shuts down heating and 'locks' out further operation until 'fault' has been reset.
Suburban uses 170*F fixed temp t-stat and has a reset button that allows t-stat to be manually reset
Atwood uses 180*F fixed temp t-stat that will auto reset when water temp cools off enough
Both have 'fault' lights and that has to be reset (Turn switch OFF then back ON)
Atwood also has a thermal cutoff fuse.........it is a one shot device that trips at 190*F due to blow back out of combustion chamber. When it trips it shuts down all operation and device has to be replaced.
It is connected to normal t-stat (has a clear tube over fuse)
Weeping T&P Relief Valve can be caused by:
*Weak T&P .........replace
*Loss of 'Air Pocket'
Water heater is designed with an air gap at top of tank. Air can be compressed so as water swells from being heated the air allows for this increase w/o a big increase in pressure.
Lose the air pocket and pressure increases as water swells from heating causing T&P to weep.
Establish air pocket
1) Turn off water supply
2) Open faucet hotside to relief pressure
3) Open T&P via Lever....hold open ntil water stops running out then let valve snap close
4) Turn on water supply
5) Close faucet
*Dirty T&P
Open via lever let snap close couple times to clear valve seat (CAUTION: Do with water supply on so water blows out----water can be very HOT)
Then re-establish air pocket
Which Brand/Model do you have and if Atwood which year (Changes made in 2004)
