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Old 11-30-2011, 05:00 PM   #16
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American Standard Freedom 80 LED Light Blinks 4 Times


You can TEMPORARILY AND I MEAN TEMPORARILY jumper it out to see if it is the problem. It may be partly/lightly/weakly closed. Should have 0 ohms resistance if closed.

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Old 11-30-2011, 06:30 PM   #17
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American Standard Freedom 80 LED Light Blinks 4 Times


doesn't matter what scale its on.....just ohms is fine, then touch the leads together and observer what the reading is......now with the two yellow wires OFF the limit, touch 1 lead to each tab on the limit at the same time.....the results should be the same as when you touched the leads together, if not then the limit is tripped. remove the limit and smack it down on a hard flat surface and check it again. Also check you private messages.
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Old 11-30-2011, 11:28 PM   #18
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American Standard Freedom 80 LED Light Blinks 4 Times


I love the fact that "smack it down on a hard flat surface and check it again." was the solution. Thanks for all of the help! Do I have to worry about the part that I slapped on the concrete?
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Old 12-01-2011, 01:43 AM   #19
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American Standard Freedom 80 LED Light Blinks 4 Times


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I love the fact that "smack it down on a hard flat surface and check it again." was the solution. Thanks for all of the help! Do I have to worry about the part that I slapped on the concrete?

Only if you dont keep your filter changed on a regular basis, BTW we call that "tricks of the trade"......glad its working.
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Old 09-28-2012, 12:30 AM   #20
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American Standard Freedom 80 LED Light Blinks 4 Times


Just spent $123 to find out the 4 light flash was a $15 replacement part! It was the capacitor that sits on top of the blower housing. Just remove the filters and it's located on the top left side. Hopes this helps someone in the future!
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Old 09-28-2012, 12:33 AM   #21
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American Standard Freedom 80 LED Light Blinks 4 Times


Just spent $123 to find out the 4 light flash was a $15 replacement part! It was the capacitor that sits on top of the blower housing. Just remove the filters and it's located on the top left side. Hopes this helps someone in the future!
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Old 11-10-2012, 01:04 PM   #22
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American Standard Freedom 80 LED Light Blinks 4 Times


Harleyrider's "smackdown" solution worked for me too. You just paid for my cocktails last night my friend - - THANK YOU VERY MUCH!
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Old 01-10-2013, 01:00 AM   #23
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American Standard Freedom 80 LED Light Blinks 4 Times


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Only if you dont keep your filter changed on a regular basis, BTW we call that "tricks of the trade"......glad its working.
I am seeking help with this problem, kind folks...I found and pulled the high limit switch. I have the same unit described here. It ohms out, so it's not tripped. I did the ole bang job with the switch a few times on the workbench for god measure. I reinstalled the switch. Still, I got 4 flashes.

I then bridged the terminals together, and powered up the unit for 5 sec, and then off. I read a few places that this should reset the system when this occurs. And yes, my filter was terribly dirty...shame on me, yes. I then removed the bridge I created between the two terminals. I let the system sit for 5 min OFF. Then, I powered the system up again. And again, once the system comes up, the burners come on as usual, but no fan (same as all the other times). And I still get 4 flashes.

Could this high limit switch have truly taken a dump? The unit is 10 yrs old. I also have a 10 yr old heat pump attached, but I don't believe from reading that this has anything to do with my problem. I don't get an AUX Heat warning on my thermostat, so it's never getting up enough to activate the heat pump. Any other help out ther ?

-paul
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Old 01-10-2013, 06:45 AM   #24
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American Standard Freedom 80 LED Light Blinks 4 Times


Look at the amount of dirt on surface of the inducer fan. It appears that the filter was neglected for a long time on this furnace, and a general overall deep cleaning is needed, including removal of the main blower motor and wheel, the burners, etc. etc.

Until its clean, how can you diagnose anything?
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Old 01-10-2013, 01:13 PM   #25
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American Standard Freedom 80 LED Light Blinks 4 Times


No fan is your problem. Need to check if the control board is sending 120v to the motor or not
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Old 01-10-2013, 08:47 PM   #26
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American Standard Freedom 80 LED Light Blinks 4 Times


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Look at the amount of dirt on surface of the inducer fan. It appears that the filter was neglected for a long time on this furnace, and a general overall deep cleaning is needed, including removal of the main blower motor and wheel, the burners, etc. etc.

Until its clean, how can you diagnose anything?
It was only 6 mos between filter cleanings...long, but not an eternity. My unit has four filters - two traditional screen types and two electrostatic units. Yes, very dirty. But, the inducer fan is very clean as is the blower wheel. Already checked all of that. Burner area and heat exchanger are clean as a whistle.
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Old 01-10-2013, 08:48 PM   #27
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American Standard Freedom 80 LED Light Blinks 4 Times


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No fan is your problem. Need to check if the control board is sending 120v to the motor or not
Hmmm. I'll check that in 30 min and report back...
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Old 01-10-2013, 09:13 PM   #28
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American Standard Freedom 80 LED Light Blinks 4 Times


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Hmmm. I'll check that in 30 min and report back...
OK, power is confirmed at the blower motor...I'm getting 120V...
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Old 01-10-2013, 09:57 PM   #29
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American Standard Freedom 80 LED Light Blinks 4 Times


I have two limit switches, of sort. One enters the combustion area of the burners and has the two-prong 4" long probe like the one pictured above in this thread. The 2nd limit switch enters the blower case and rather than the two-prong probe style, it is just a short 1/8" button probe. For the life of me, I cannot figure out which one is the "high limit switch" that seems to yield the 4 LED flashes I'm getting. I can tell you that both probes are very clean, and both have continuity (they're not open) no matter how much force I exert on the probes (they're not worn out inside is my point).

Any other ideas friends?
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Old 01-11-2013, 10:31 PM   #30
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American Standard Freedom 80 LED Light Blinks 4 Times


I found that the old high limit switch was intermittently going to 'open'...so I found a replacement, new Trane part, but the problem persists - same 4 flashes. Any other ideas? Is there some area of the combustion section that sucks air into the system that is blocked somehow...that's what I'm starting to research at this hour. I just think that the switch is hitting 200 deg and tripping. My blower motor does not run...I'm guessing that the system must exhaust any CO2 prior to kicking on the blower to feed the registers, and since the chamber gets super hot, it shuts off. Hmmmmmmmm....

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