As anyone had any problems with the DiversiTech SOS-1 safety overflow switch that snaps on the condensate line? I was using two of these in series, one on the primary and one on the secondary drain...What was happening was that I was getting a voltage drop at the contactor coil which was making it chatter....I removed one of them and the voltage was fine...I had called the manufacturer tech line and told them of the problem that I had..Their response was that ONLY ONE OF THESE CAN BE USED.... I wish that the instructions would have said that before I installed them...I think the reason is because it is an electronic switch and not a mechanical...Any thoughs on this ??????