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Old 01-14-2009, 11:52 AM   #1
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Amana furnace-variable speed blower

A few weeks ago , I had a 250v spike go through my house and take out a couple of things, including my model # GUVA070BX40 gas furnace. The transformer, and the variable speed motor were replaced. The original control board and two new ones, [a third one is on the way] all do the same thing. When heat is called for, the inducer motor starts, but 1 second later, the new blower motor starts, and very quickly ramps up to' what sounds like full speed. 15 blinks of the green led. Which I guess means 1500 cfm. The furnace then goes through it's normal sequence, everything else is as it should be. There are no error codes on the red led. The furnace tech claims that overtemp switches check out. Amana tech-line isn't much help. There are 27v on pin 5 coming from the control board, going to the motor. The tech said there should'nt be. That's why we have new board # 3 coming. The odds of three boards doing the same thing, and the boards being the problem are astronomical. The furnace repairman and I think that the problem is other than the motor and control board.


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Old 01-14-2009, 02:25 PM   #2
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3 bad boards? Not likley. Unless the wrong boards. Make sure they installed the correct motor. VS motors are not all the same each has programming specific to the furnace. It my be reading the signals incorrectly. Just a thought.


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Old 01-14-2009, 05:26 PM   #3
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York has 2 wires reversed compared to everybody else for controling hte ECM.
If they are using a ver 2.3 intended for a York/UPG product, that would be a problem.
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