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Air Conditioning/Thermostat Selection randallbrink 05-16-2008
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Posted by Tony Hwang on May 16, 2008, 10:14 pm
randallbrink wrote:
> I have a puzzling problem. When 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. On 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. I have replace the
> thermostat, and have the same problem.
>
> Any help will be greatly appreciated, as the outdoor temperature is
> now 90F.
>
>
Hi,
Model of outside unit, furnace inside and your thermostat?
Do you have a multimeter? How many wires are on the 'stat.
When you are calling for cooling, you should see 24V AC between
terminals on the 'stat R and G and again between R and Y(since outside
fan runs you must see 24V AC here) If you don't see 24V AC between R and
G 'stat is bad.

Posted by randallbrink on May 17, 2008, 8:35 am
> 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.
>
> Hi,
> Model of outside unit, furnace inside and your thermostat?
> Do you have a multimeter? How many wires are on the 'stat.
> When you are calling for cooling, you should see 24V AC between
> terminals on the 'stat R and G and again between R and Y(since outside
> fan runs you must see 24V AC here) If you don't see 24V AC between R and
> G 'stat is bad.

I'll do this test. However, the same problem has re-occured after
replacing the thermostat. I can, however, access the wiring with the
system in operation.


Posted by Mikepier on May 17, 2008, 10:42 am
It sounds like a wiring problem somewhere. You already confirmed the
fan and compressor are working, which is good. You just need to
confirm if the wiring is correct. If it is, it could be a defective
circuit board on your A/C unit.

Posted by randallbrink on May 17, 2008, 2:47 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.
>
> Hi,
> Model of outside unit, furnace inside and your thermostat?
> Do you have a multimeter? How many wires are on the 'stat.
> When you are calling for cooling, you should see 24V AC between
> terminals on the 'stat R and G and again between R and Y(since outside
> fan runs you must see 24V AC here) If you don't see 24V AC between R and
> G 'stat is bad.

Furnace is Coleman 8.T and the AC unit is a Lennox HS18-411-5P.



Posted by Roy Starrin on May 17, 2008, 10:47 am
On Fri, 16 May 2008 18:23:24 -0700 (PDT), randallbrink

>I have a puzzling problem. When 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. On 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. I have replace the
>thermostat, and have the same problem.
Did this just suddenly happen to an existing installation, or was
anything changed in the installation before the problem began, e.g.
wiring, equipment, supporting electrical wiring, etc.


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