I have a 6-year-old TempStar SmartComfort 2000 A/C unit that's
generally behaved well up until this year. But now we're having serious
problems and the two techs that have come out have not been able to
resolve the issue. I'm not electrically inclined and I don't know much
about HVAC in general, so I'm hoping someone might have some advice on
Basically, the symptoms are these:
* From an off state, I turn on the thermostat to Cool and the
compressor starts up. About 20-30 seconds later, the blower on the
furnace comes on. The air's good and cold -- no problems so far.
* Anywhere from 10 to 30 seconds later, the compressor and fan click
off and then immediately back on. It repeats this 4 or 5 times, speced
anywhere from 5 - 30 seconds apart. After that, the compressor/fan
* As soon as the compressor stops, the furnace's blower kicks into high
gear. It is then impossible to stop the blower by means of the
thermostat. Turn it off, turn up the temp, turn it to heat, remove it
from the wal, ... the blower keeps going. To turn it off I have to use
the switch in the furnace cabinet.
* Now, even though it's off, if I turn the switch in the furnace
cabinet back on, the blower comes right back on (compressor/fan still
off) and will run indefinitely (as far as I know -- I've let it go for
an hour once before shutting it off again).
I end up having to wait anywhere from an hour to a day or more before I
find I can turn the switch in the furnace cabinet back on and NOT have
the blower start. At that point, I can restart the whole process: turn
on the A/C and the compressor comes on, etc.
The two techs that cme out both diagnosed the problem as the compressor
overamping. Here's their exact diagnoses:
"Unit is way overamping. Rated at 18.6 amps, amping at 19.8 amps.
Overamping due to burned contact points and wrong size fuses."
"While out by condenser running, compressor dropped out. When it reset
checked amp drain. Compressor is overamping, will need to replace."
The second tech said the burned contact points and fuse couldn't be the
problem and that the entire compressor would have to be replaced. Based
on other feedback I've received, the consensus seems to be that neither
tech is correct.
Thanks for reading all of that, and thanks for any advice you can give
me. I'm scheduling a third tech to come out but would like to have more
of a clue before he starts so hopefully I can steer him in the right