My wife came in from the garage saying that the heat/ac unit was making a
noise although it was off at the thermostat. My neighbor says that the
transformer always is buzzing , while I have never noticed one way or the
other. Is this normal? Thanks for any help.
In addition to what trade suggested I would suggest that where most of
our participants live it is now past the A/C season and you should be able
to shut down the system. That would include shutting down A/C (not
heatpump) including the 240V supply. That may kill the transformer. Then
you can decide if it is enough of a problem to replace it or wait and see
what happens in the spring and maybe when it is warmer it may quiet down.
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