On Thu, 21 Oct 2004 15:19:05 -0700, "PrecisionMachinisT"
It is making sound only in heating mode.And not every time when heat
pump working. I do have a very old unit ( from 1987?) and before rel
winter strt in DC area I want to be sure that unit is working
Suggest maybe call in a pro.
But like I say, you could trace the reversing valve wiring, because it
sounds as if the valve is not holding for some reason--this is not normal
and will eventually damage the unit.
Heres a link :
If it still dont make sense to you after reading the above then definately
call in a pro, it very well could just be a loose wire, and if this be the
case then it shouldnt be a very expensive fix.
In all seriousness:
Does it only in heat mode, right?
Turn the circuit breaker off to the indoor AND the outdoor unit. Open the
outdoor unit to gain access to the circuit board. VERY carefully, remove the
screws that hold down the circuit board. Look at the back of the board and
see if there isn't a nest that a spider has made.....
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