I have a Lennox 12ACB42(3 1/2 ton) split central a/c unit that from time to time quits cooling. This has happened 4 times this summer in Plano, TX where it's been real hot. Anyway, With each cooling shutdown I have done the following:
Turn the compressor off at the thermostat leaving fan running
I have hosed down the unit
I waited about 30 min's and turned it back on
In each case it started cooling again - sometimes 6 weeks between failures?
I have had the unit checked on 2 seperate occasions and everything checks out? Freon full - Compressor running OK
However the last time I had it checked the technician noticed that the compressor had some high head pressure readings and he thought it was slowly dieing.
Does this sound right???????