When I did electriacal service as well as HVAC I would always get 7 or 8 calls a year from farm houses their well wasn't working. Back in Kansas the well is usually located 6' or more underground and the pressure switch contacts would always be full of ants everytime.
I have been granted access by the last and current owner for 20+ years. Help them when needed call before I go and no one lives there now, just a weekend place and for the BSA Troop. Got a call today remote works fine.
Ants can't move a rubber tree plant but they can mess with a set of contacts
You know Scott, I wonder why things like that are not sealed systems. The fire ants are a big problem here with my a/c unit and water well. There is something to be said about the a/c going out in the middle of the night or not having any water in the morning.