How is it going? I just moved into a place I bought. It has separate AC units for both floors. We started having an issue with one of the air handler units. One night when turning the air on the outside AC unit turned on but the air handler unit never kicked on. Next day while at work an HVAC tech came out and told my wife he messed with some wires and it kicked on. Well, since then it has stopped twice again. I went into the attic and was messing with the wires but all seemed fine. I happened to touch the top of the motor with a screwdriver and it kicked on. Thought to myself well maybe there was a loose wire and it may have just gotten the signal to turn on. However, tonight while troubleshooting again I took off the cover and again touched the top of the motor with a screwdriver and wouldn't you know, the unit kicked on.
What in the world could be the cause of this? Some sort of ground issue?
Best Answer
I had a similar issue and could have sworn it was mechanical/electrical. I had a service man come in and he removed the air filter from the handler. It started right up afterwards (i am unsure if there was a reset switch he had to trip). He mentioned that my air handler will shut off if there is a great enough pressure difference between the supply and handler sides of the filter. Never thought of that but worth a try before you spend the monies!