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Posted by randallbrink on May 19, 2008, 6:32 pm
> randallbrink wrote:
> > I have a puzzling problem. =A0When I select "Cool" on my thermostat, the=
> > central fan does not come on, and so, while the air conditioner
> > outside runs, it quickly freezes, as there is no air movement. =A0On the=
> > other hand, if I select the heat-cool switch to "Off" and turn the fan
> > "On" the fan works fine. But if while the fan is running, I move the
> > Heat-Cool switch to "Cool" the fan shuts off. =A0I have replace the
> > thermostat, and have the same problem.
>
> > Any help will be greatly appreciated, as the outdoor temperature is
> > now 90F.
>
> On many furnaces, the fan speed for A/C is different (and higher) than
> the fan speed for heating or for thermostat "Fan". =A0The problem could
> well be in the furnace (where your fan is). =A0It could be the higher
> speed winding on the motor is open, the connection to that winding
> is open, or there is a problem with the relay in the furnace that
> controls the fan. =A0Contrary to the diagram on page 16 of the pdf
> for the outdoor unit, the "Y" wire often goes to the furnace and is
> used by the furnace to turn on the fan and select the speed.
Ah. Yes, this has a true ring to it, because that would explain why
the fan works fine as long as "Cool" is not selected on the thermostat
mode selector.
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