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Ihave an American Standard furnace that Iam working on and the blower motor is running in the wrong direction.

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  • Robert Mar 15, 2011

    Hello, do you have 2 yellow wires and 2purple wires with this motor?

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  • Master
  • 4,736 Answers

It's wired backwards,because the polarity has been changed. That's why it's running in reverse.

Posted on Mar 16, 2011

  • tmking58 Mar 22, 2011

    yes. The 3 wires that control the polarity were never changed from the factory
    I had to phisacally change 2 of the wires to reverse direction.

  • Rich Landrum Mar 22, 2011

    Great to hear that you were able to change the polarity. Amazing that the factory shipped the unit wired in reverse. But, I find this more and more. Some people don't take pride in their work, any more. Happy to have been able to help you. Thanks for letting me know. I always appreciate a questioner who lets me know I have been able to help them. Unfortunately, some just use my advice to solve the problem and never say, "Thank you." You're certainly the exception.

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What is the cost of the of having a person replace a capacitator on an Amercan Standard furnace


Most of that charge (the $200.00) was likely the service call itself. IF you don't have a maintenance agreement with these folks they charge an arm and a leg for service calls. The fan will be much more pricey than the capacitor, and you will certainly get another service call charge. You may want to ask about a maintenance agreement at that time. Some places will waive the service charge if you purchase one. Then you basically get the semi-annual servicing for the same price as you would have paid just to have the blower replaced (depending on the contract cost)..

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My gas furnace kicks on but does not blow out how do I fix that?


Belt could be broke or blower motor could be bad thats what was wrong with mine

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The blower motor does not come on when we turn the air conditoner on, but does come on when the furnace come on it blows out fine. it is an american standard. the unit on the outside is running strong,...


Hello, turn off power to the furnace and remove the thermostat, then take the R and W Wires and put a jumper wire between them, then turn power back on if this turms on the furnace then you have a bad thermostat if it does not it is a problem with the integrated control board or possibly a low voltqge wire is loose.

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Gas furnance lights but fan does not come on. buzzing sound from panel near fan.fan is not jammed it spins freely.unit is seven years old.


Most furnaces equipped with an electronic control board activate the same blower speed for heating and continuous fan. If the cooling speed works, the problem is likely in the circuit board (relay) or wiring to the motor. Check and rectify.

Jan 11, 2011 | American Standard Heating & Cooling

1 Answer

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

Aug 22, 2010 | American Standard Heating & Cooling

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Blower motor is either burnt or Ihave also seen the fan relay on the board burnt..test for 120v power out of the board at the blower leads if so replace motor, of no replace board

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Sounds like motor has failed. If the red light is blinking it may be telling you what is wrong by the number of blinks. It maybe locked out for some reason or loose wire. Try turning off breakers to inside unit for 5 mins and try again, this may reset unit. But it sounds like a bad motor or circut board. Try running with stat in on position instead of auto in cooling mode.

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try checking the pressure sensing switch,it has a tube that should run somewhere close to the inducer fan.sometimes this hose fills with liquids,and makes the units act funny.I don't know if you have a condensing unit or what.the furnace wont try to light if it cant tell the inducer motor is running.any induced draft unit will work this way.you can also do a temp. bypass of the pressure switch to make sure the contacts on it are closing just be sure your inducer fan is running,and you cant leave it like that its just a test.that is a safety feature you really need.

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I am concerned of the readings you have given. 120 volts to ground, but 168 volts to neutral? And having 10 amps of current at the "ventor", but only 1 amp for the whole furnace worries me, because power for the "ventor" comes through the furnace.

You should not have 168 volts to anything! Unless somehow 240 volts is feeding the system, and there is a medium resistance short somewhere.

The controller boards are sensitive to AC polarity (if you will). Neutral should be tied to neutral on the board. You can check that by testing for voltage between the neutral terminal and chassis ground (assuming the chassis is properly grounded.). The hot leg of incoming power, which should be 120 volts, should be connected to the terminal that says 120 VAC.

If your getting 168 volts AC somehow, then something is wrong, and you need to disconnect power from this unit until you find the cause.

As a heat-A/C tech, you should know the sequence of operation for all furnaces is pretty much the same. The boards, while manufactured by different manufacturers, all operate pretty much the same way.

Let me know your findings in reply and I will attempt to help you more.

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