The newer units often have these newfangled electronic blower
motors that start out very slow and ramp up in speed then stay
running at a very slow speed for a while and make you think
something is wrong with it. It could also be the winding in the
blower motor since the speed is often different between the heat
and cool modes. It could be as simple as choosing another motor
lead wire and running it until he gets another motor if the AC
doesn't work well at that speed.
I pulled a plastic garbage bag out of an evaporator
one time. Another time I crawled under a house, cut
an access door into the ductboard and pealed a 1/2"
layer of pet hair off of the evaporator and it came
off in one piece like a piece of felt. The coil was
clean after that and worked well. Dirt is the enemy.
Has there been much rain lately? One winter morning I awoke to a
gurgling sound from the furnace. I immediately shut off the electricity
to the furnace. Heavy rain had flooded my furnace pit high enough to
reach the blower. If it had continued to run, it could have ruined the
motor, gotten the computer board wet, and made the house very humid.
The previous homeowner had had two computer boards and a blower motor
ruined by water.
The flashing grounding-problem indicator also suggests that moisture may
be your problem. It's possible that nothing has been damaged.
I don't know if the moisture could have come from a backed-up
condensation drain. Outside, at the exit of my drain, I have a pit big
enough to put a small container under the end of the pipe. If when it's
fairly humid inside I can catch a cup of water in five minutes or so,
that's a sign that things are working well.
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