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Old 10-01-2011, 03:19 PM   #1
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American Standard Freedom 90 error


Turned house to HEAT this morning. AM Standard Freedom 90 Dual Stage Furnace doesn't kick on. Error codes flashes 3 fast blinking RED lights (labeled PORT on circuit board) and then 3 slow blinking GREEN Lights (labeled STATUS on circuit board).

3 flash red on back cover state "pressure switch" fault. Where is the pressure switch? From reading many threads, I blew out all hoses I could with a compressor. Still no luck. Anyone have other ideas?

Thanks in advance

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Old 10-02-2011, 06:00 AM   #2
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American Standard Freedom 90 error


Check condensate drain.

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Old 10-02-2011, 10:59 AM   #3
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American Standard Freedom 90 error


Pressure switch is what hoses attach to. Go to inducer fan to start it.

Consider this video but play around this area of YouTube for more relevant videos. Start up sequence ones in particular.

http://www.youtube.com/watch?v=I86jo...eature=related
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Old 10-02-2011, 11:09 AM   #4
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American Standard Freedom 90 error


I have blown out ALL hoses and drain pipes. I even flushed the drain pipe. Still no luck. When the furnace is turned on, Nothing starts up. Only the circuit board lights a red and green bulb. Red flashes 3 and green flashes 3. I have even tried to disconnect the drain hose from going into the conduit drain pipe, because i am positive ALL hoses have been blown out with my compressor.
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Old 10-02-2011, 11:10 AM   #5
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American Standard Freedom 90 error


how could I start the inducer fan?
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Old 10-02-2011, 11:15 AM   #6
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American Standard Freedom 90 error


Spin the wheel on the front of the inducer fan. Then turn the heat on. Sometimes they stick.
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Old 10-02-2011, 02:01 PM   #7
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American Standard Freedom 90 error


Now I really screwed up. In trying to start the inducer fan some told me to jump the G and R terminals. That just started the blower. But in doing this I screwed up by touching the white(which I think is common and a spark happened. Now the red and green light are on solid indicating system error and not the 3 blinks. Time for a mechanic? Did I blow out the circuit board?
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Old 10-02-2011, 02:07 PM   #8
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American Standard Freedom 90 error


Quote:
Originally Posted by dblckmr View Post
Now I really screwed up. In trying to start the inducer fan some told me to jump the G and R terminals. That just started the blower. But in doing this I screwed up by touching the white(which I think is common and a spark happened. Now the red and green light are on solid indicating system error and not the 3 blinks. Time for a mechanic? Did I blow out the circuit board?
G-R will turn on blower motor.
R-W call for heat normally


Check the fuse.....you should have code error table in the back of the cover
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Old 10-02-2011, 02:11 PM   #9
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American Standard Freedom 90 error


Solid red and solid green state internal system error. Not much help. I checked fuses but there is power to the board still.
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Old 10-02-2011, 02:22 PM   #10
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American Standard Freedom 90 error


I think the white was labeled B/C. What is that?
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Old 10-02-2011, 02:29 PM   #11
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American Standard Freedom 90 error


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I think the white was labeled B/C. What is that?

common wire ?

Turn off everything and try again.
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Old 10-02-2011, 03:15 PM   #12
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American Standard Freedom 90 error


So, I did blow the 5 fuse on the circuit board. Back to the 3 flashes. Can I jump the R to something to start the inducer motor?
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Old 10-02-2011, 03:20 PM   #13
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American Standard Freedom 90 error


jump the r to the w for heat.

r is the power, 24 volts. when you touch (jump) that to anything you are making a circuit.

g to bring on fan, y for cool, w for heating.
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Old 10-02-2011, 03:23 PM   #14
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American Standard Freedom 90 error


I should be able to hear the inducer, right? I think that's my problem. I can even identify the inducer?
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Old 10-02-2011, 03:27 PM   #15
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American Standard Freedom 90 error


yes, you should be able to hear the inducer MOTOR coming on. You should be able to see it spinning as well. it has a small fan blade on it.

looks like this.


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