IT IS A COMMON THING on these machines to have dust on the contactor plunger. You will have 24+ volts at the coil and just a light touch on the plunger while it is calling will allow it to pull all the way in. Cleaner will not work.
Originally Posted by valdelocc
Replace the contactors with ones with dust guards and completely seal the entire terminal box with foil tape and thumb grade caulking. Because of the design of this box, it is a dust magnet being in the condenser airstream. Foam tape the terminal sheet metal cover also.
Can I guess that there may be road/building construction going on nearby?
"Iron sharpeneth iron..."