hi; i installed and repaired sears operators for thirty years. if it takes out only your 24v circuit it is not likely your high voltage source, the problem could be in the 24v load, ie the wiring to your door button or to the door sensors or somewhere in between. that being said, the fact that both operators are involved is very curious. also check your travel adjustment and force adjustment. door should reverse automaticlaly on a one inch obstruction, like a one inch board. if it does not, adjust your force and travel until it does. travel is adjusted so the operator closes the door completely and when stopped is applying light down pressure on the door also the operator is not designed to operate an out of balance door. don't expect it to lift an door you cannot lift easy yourself. with the operator disconnected from it. a sectional door should not come crashing down when you open it about half to three quarter of the way. if it does it needs adjust, don't try to do that your self, you could get hurt. a one piece door properly balanced will hang in air about belt buckle high without crashing down. soooooo if your travel is set so the operator does not shut off at end of travel and force is not set light enough to let it reverse it can sit there in that position and cook the board and or motor. good luck, hope this helps
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