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My blower and compressor are always running rajasethuraman 10-08-2007
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Posted by on October 8, 2007, 12:44 am
Hello experts

I am facing a unique problem with my central air system.

Make of the system is Goodman.

For the past two months, my central air system\s blower and compressor
would not shut off when I place the thermostat to off position.

I called a specialist from Sears. He studied at my system for more
than 2 hours and could not diagonize the problem. But he suggested to
try changing the furnace circuit board.

I ordered a new circuit board and replaced it myself. Same problem.
Blower / Compressor won't shut-off.

Then, I read in the internet that the cooling part of my thermostat
might be broken. So, I changed my thermostat. Same problem continues.
(my old thermostat was white-rodgers and my new one is Honeywell)

Now I am running out of options.

Please help me.

Thanks in advance.

Regards
Raja


Posted by Zyp on October 8, 2007, 12:50 am
rajasethuraman@gmail.com wrote:
> Hello experts
>
> I am facing a unique problem with my central air system.
>
> Make of the system is Goodman.
>
> For the past two months, my central air system\s blower and compressor
> would not shut off when I place the thermostat to off position.
>
> I called a specialist from Sears. He studied at my system for more
> than 2 hours and could not diagonize the problem. But he suggested to
> try changing the furnace circuit board.
>
> I ordered a new circuit board and replaced it myself. Same problem.
> Blower / Compressor won't shut-off.
>
> Then, I read in the internet that the cooling part of my thermostat
> might be broken. So, I changed my thermostat. Same problem continues.
> (my old thermostat was white-rodgers and my new one is Honeywell)
>
> Now I am running out of options.
>
> Please help me.
>
> Thanks in advance.
>
> Regards
> Raja

I'd call another company! It sounds like a problem that can't be fixed
here. Try alt.home.repair.

--
Zyp



Posted by Tony Hwang on October 8, 2007, 1:00 am
rajasethuraman@gmail.com wrote:
> Hello experts
>
> I am facing a unique problem with my central air system.
>
> Make of the system is Goodman.
>
> For the past two months, my central air system\s blower and compressor
> would not shut off when I place the thermostat to off position.
>
> I called a specialist from Sears. He studied at my system for more
> than 2 hours and could not diagonize the problem. But he suggested to
> try changing the furnace circuit board.
>
> I ordered a new circuit board and replaced it myself. Same problem.
> Blower / Compressor won't shut-off.
>
> Then, I read in the internet that the cooling part of my thermostat
> might be broken. So, I changed my thermostat. Same problem continues.
> (my old thermostat was white-rodgers and my new one is Honeywell)
>
> Now I am running out of options.
>
> Please help me.
>
> Thanks in advance.
>
> Regards
> Raja
>
Hi,
Your outdoor unit gets power when signal from thermostat calles for
cooling. Y terminal from 'stat goes to 24V AC which goes to board on the
air handler(inside unit-furnace) and then to out door unit. This 24V
will pull main contactor which will supply power to compressor and fan.
What happens if you turn off the breaker supplyng power to the unit?
Since replacing 'stat won't do anything, probably the main contactor is
stuck closed due to badly pitted contacts. Trouble-shooting is
excercising logic step-by-step. Don't try to shot gun it wasting time
and money. That Sears guy sounds like he does not know what he is
talking about. What a shame!

Posted by on October 8, 2007, 1:09 am

> rajasethuraman@gmail.com wrote:
> > Hello experts
> >
> > I am facing a unique problem with my central air system.
> >
> > Make of the system is Goodman.
> >
> > For the past two months, my central air system\s blower and compressor
> > would not shut off when I place the thermostat to off position.
> >
> > I called a specialist from Sears. He studied at my system for more
> > than 2 hours and could not diagonize the problem. But he suggested to
> > try changing the furnace circuit board.
> >
> > I ordered a new circuit board and replaced it myself. Same problem.
> > Blower / Compressor won't shut-off.
> >
> > Then, I read in the internet that the cooling part of my thermostat
> > might be broken. So, I changed my thermostat. Same problem continues.
> > (my old thermostat was white-rodgers and my new one is Honeywell)
> >
> > Now I am running out of options.
> >
> > Please help me.
> >
> > Thanks in advance.
> >
> > Regards
> > Raja
> >
> Hi,
> Your outdoor unit gets power when signal from thermostat calles for
> cooling. Y terminal from 'stat goes to 24V AC which goes to board on the
> air handler(inside unit-furnace) and then to out door unit. This 24V
> will pull main contactor which will supply power to compressor and fan.
> What happens if you turn off the breaker supplyng power to the unit?


It still runs, DUH!
Why, you ask, because it's magical.


> Since replacing 'stat won't do anything, probably the main contactor is
> stuck closed due to badly pitted contacts. Trouble-shooting is
> excercising logic step-by-step. Don't try to shot gun it wasting time
> and money. That Sears guy sounds like he does not know what he is
> talking about. What a shame!


Were you the tech?
I have to ask, since you're assuming the indoor blower isn't what he's
talking about.



Posted by Tony Hwang on October 8, 2007, 1:24 am
kjpro @ usenet.com wrote:
>
>>rajasethuraman@gmail.com wrote:
>>
>>>Hello experts
>>>
>>>I am facing a unique problem with my central air system.
>>>
>>>Make of the system is Goodman.
>>>
>>>For the past two months, my central air system\s blower and compressor
>>>would not shut off when I place the thermostat to off position.
>>>
>>>I called a specialist from Sears. He studied at my system for more
>>>than 2 hours and could not diagonize the problem. But he suggested to
>>>try changing the furnace circuit board.
>>>
>>>I ordered a new circuit board and replaced it myself. Same problem.
>>>Blower / Compressor won't shut-off.
>>>
>>>Then, I read in the internet that the cooling part of my thermostat
>>>might be broken. So, I changed my thermostat. Same problem continues.
>>>(my old thermostat was white-rodgers and my new one is Honeywell)
>>>
>>>Now I am running out of options.
>>>
>>>Please help me.
>>>
>>>Thanks in advance.
>>>
>>>Regards
>>>Raja
>>>
>>
>>Hi,
>>Your outdoor unit gets power when signal from thermostat calles for
>>cooling. Y terminal from 'stat goes to 24V AC which goes to board on the
>>air handler(inside unit-furnace) and then to out door unit. This 24V
>>will pull main contactor which will supply power to compressor and fan.
>>What happens if you turn off the breaker supplyng power to the unit?
>
>
>
> It still runs, DUH!
> Why, you ask, because it's magical.
>
>
>
>>Since replacing 'stat won't do anything, probably the main contactor is
>>stuck closed due to badly pitted contacts. Trouble-shooting is
>>excercising logic step-by-step. Don't try to shot gun it wasting time
>>and money. That Sears guy sounds like he does not know what he is
>>talking about. What a shame!
>
>
>
> Were you the tech?
> I have to ask, since you're assuming the indoor blower isn't what he's
> talking about.
>
>
Hi,
Me? I am no tech. Retired engineer from Honeywell after 30 odd years.
OP said blower and compressor which made me to think ODU. Then wonder
if he refered to compressor outside and blower inside?

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