We have a standard Sears in-duct air cleaner with two slide-in "elements"
I installed it and have mainainted it for many years. Heard a continous arcing one day. All the plates and wires are intact and the unit was cleaned with a pressure washer and allowed to dry.
I get continuous arcing from the element frame to the metal rail that it rests on. The same element exhibits the same problem independent of front or back position.
Upon close examination, one of the white insulators looked "burned" ...I broke it apart and note what looks like a black carbon filling? I was expecting a solid white nylon insulator. The removed insulator did not impact the mechanical integrity of the unit, so now there is a finite air gap there. The unit still arcs.
An electronics guru told me that over time, these insulators "breakdown". Anyone ever hear of such a thing?
They are not replaceable parts, but I could probably disassemble the element and substitute nylon "insulators".
Any advice other than chucking the entire unit?? Stew Corman from sunny Endicott