George
I know this is quite a time since you made the posting regarding your Aqua-Hot float switch.
I just have something to add: DO NOT BY-PASS the switch untill everthing is checked
Please understand, Just because you see fluid in the recovery tank, don't assume the Float switch has failed, the only positive way to check is
#1, Make certain your A/H is absoutely cool
#2, Remove the coolant (radiator) cap, try to touch the coolant with your finger,If no fluid, fill from this location (a small water bottle makes this a little easier)
I also see your switch failed a second time, Check for proper installation, (proper position), even coolant PH
Thanks
Orman Claxton