I have a Lennox Central Air Unit from 1989 that began to give me problems last week.
First last week the copper line on the furnace/central air unit stated to freeze. The unit subsequently shut down. When I tried to re-start the Central Air at the thermostat the blower fan would not turn on. After a period of time (a few hours) I was able to turn the AC back on. I don't know why the Central Air unit wouldn't turn back on? Possible Freeze Stat?
I suspected the refrigerant charge was low and had a tech install 5lbs of R-22 and check for leaks. No leaks were found.
Now I have the opposite problem. I no longer have a freezing problem now the copper line, furnace and basement ducting is dripping from condensation. Last night the Central Air Unit began to make a loud grinding noise. I couldn't tell if the blower fan was making the noise. Like before the unit would not come back on until a few hours later. Flood-back?
The condensate pump is coming on but I suspect come kind of flow problem from the drain pipe? Maybe the unit was overcharged?
Any suggestions?
Joe E.