Originally Posted by Newellri
Is there a way to ck the hi limit? Thanks
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Simply put, you can consider the hi-limit t'stat as a fuse. If you will notice in the pic (red and yellow lines pointing to), that the small strip is burned out in the 120v bad one (black wires) but is not over on the 12v t'stat side (red wires).
All you have to do to check it when the water inside the heater is cool
, if you can't visually see the strip burned out, is the same as with a fuse. First push in on the reset button at the top of the t'stat to make sure it has not tripped.
1. With power off at the black switch, use your multimeter to see if there is continuity between the two sides by probing the two wire leads where they plug onto the t'stat (green arrows).
2. With power on at the black switch (make sure there is water in the heater first though), use your multimeter to see if you have proper AC voltage on both sides.