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I have an American Standard unit showing error 91

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Posted on Jan 02, 2017

shastalaker7
  • 1515 Answers

SOURCE: American Standard Air conditioning unit Model 2AGB0036A1000AB

Hi I am sure this model number is correct and it is a 3 Ton unit.Normally when the breaker trips as soon as you reset it, the compressor is compromised. Happened to me yesterday on a 5 ton heat-pump. When this happens, what you can do if you are a handy type of man, is to prove this. I don't know if the is is a split system or a all in one package unit, doesn't matter. Get to the compressor compartment. Of course the power will be off.If you can see the run capacitor, take a screw driver and short across the terminals to discharge it, as it could have a small amount of juice in it, I doubt it. Anyway, remove the plastic cover to expose the terminals. They can be hard to remove sometimes, just use a screw driver to push the clips in. Wire colors should be black for common, yellow for start, and blue for run. Write down the order they were in. To be safe, tape the metal connectors so they wont touch metal when you turn the power back on. After you have done this, turn everything back on. If the breaker holds and everything else is on, fan and so on, this proves the compressor is probably shorted to ground. If this a/c is rather new, I would replace the compressor. If it is old, I would think about getting prices on a new unit. Just food for thought. Please let me know on the out come of this test, please. When a compressor shorts out, or locks up, it draws what is called locked rotor amps/LRA which could be from 49 on up, and your breaker can be 25, 30, 35 to 40 amps so it will trip. Keep me posted and do this test, it is very easy to do.
Sincerely,
Shastalaker7

Posted on Apr 18, 2010

  • 2 Answers

SOURCE: I have error codes flashing

Error codes from American Standard Pub 18-HD32D2-8, which is a one-sheet document that came with my American Standard air-conditioner:

29 = not listed

129 = not listed

80 = HPCO Fault - problem is in outdoor unit - Desscription: High Pressure Monitor Fault (hard lock out, cycle power to reset)

91 = Communication Inactive Fault - problem is in air handler - Descriptions - COMM Bit Master Clock Error, COMM Heat/Cool Demand Error, Serial Motor Communication Inactive Error

91 = Communication Fault - problem is in furnace - Descriptions: Blower motor no COMM response, Inducer motor no COMM response, Loss of heat/cool demand, Loss of clock signal

91 = Communication Fault - problem is in outdoor unit - Descriptions: Loss of Heat/Cool Demand Message (COMM), Loss of Bit Master (Clock Signal)

91 = Communication Fault - Description: Comm line is dead and no bits have been received.

By the way, I do not recommend American Standard. I've had mine 14 months and it just blew up - the entire control panel blew. My advice to you - think about a different brand.

Nancy
Scottsdale, Arizona

Posted on Sep 21, 2010

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I am experiencing the same error code on my American Standard AC and according to Public. #18-HD32D2-8, error code 126 is in the Equipment Change Alert Group and the description says "Equipment does not match value stored at startup." Then, in a footnote, it says "A device has changed since Auto Discovery (See Installer Guide *S& 0706 to reset)."

This is all Greek to me so I'm calling my AC guy. I can tell you this, however. I bought an American Standard AC brand new just two years ago and one year ago exactly, it blew up. American Standard replaced it. Now, one year later, more problems.

I question the quality of American Standard and would not be inclined to buy this brand again.

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Is the American Standard G50T 2-3-6 a good water heater? I have trying to find stuff about them on Google but I keep getting results for american water heaters not american Standard and the reviews are not...


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We are a small school that has about 14 students taking a shower after PE. We have had a 100 gallon 270,000 BTU water heater. Do you have a price quote for that heater American Standard Commercial Model...


Hi Kathlene.
Typical American Standard sell sheet for 100 270 AS also shows contact information for company with phone numbers
http://www.waterheating.com/pdf/100270.pdf
One seller shows this product for $3000 + shipping
http://shop.waterheatermaninc.com/product.sc?categoryId=2&productId=10

Rheem builds commercial gas water heaters under their name and under other brand names.
http://www.rheem.com/product.aspx?id=FC6D548B-54EC-46C9-9DC0-79DEC29198D7
Contact Rheem:
http://www.rheem.com/Contact.aspx

For example Rheem GP100-250(A) meets same delivery as American standard product
http://globalimageserver.com/fetchDocument.aspx?id=d26ba16f-c16f-4c45-90a8-d1f5d5f97020
One company sells product for $3900
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For example model GD100-250(A) meets same delivery as American standard product
http://globalimageserver.com/fetchDocument.aspx?id=276b892c-1fb8-40f1-8238-51d4a7d84846
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I have error codes flashing on my thermostat..it is an american standard model the manual for the therm. has ACOT900AC43UA on front..says to find addedum 18-HD32D2-1/69-2009 for codes i cannot find it...


Error codes from American Standard Pub 18-HD32D2-8, which is a one-sheet document that came with my American Standard air-conditioner:

29 = not listed

129 = not listed

80 = HPCO Fault - problem is in outdoor unit - Desscription: High Pressure Monitor Fault (hard lock out, cycle power to reset)

91 = Communication Inactive Fault - problem is in air handler - Descriptions - COMM Bit Master Clock Error, COMM Heat/Cool Demand Error, Serial Motor Communication Inactive Error

91 = Communication Fault - problem is in furnace - Descriptions: Blower motor no COMM response, Inducer motor no COMM response, Loss of heat/cool demand, Loss of clock signal

91 = Communication Fault - problem is in outdoor unit - Descriptions: Loss of Heat/Cool Demand Message (COMM), Loss of Bit Master (Clock Signal)

91 = Communication Fault - Description: Comm line is dead and no bits have been received.

By the way, I do not recommend American Standard. I've had mine 14 months and it just blew up - the entire control panel blew. My advice to you - think about a different brand.

Nancy
Scottsdale, Arizona

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