Question about Air Conditioners
I am a heating tech and i am just confussed. Well i think its the board but just looking for a second opinion. Call for heat and the ventor motor starts. after a few seconds the ventor quits and the main blower starts and the fault code states it is reverse wiring, something to do with the ignitor or low voltage. The power comming from the board to the ventor is 120 to ground and 168 volts to neutral. I also have a an amp draw of 10amps at the ventor but if i check the amps at the line wire coming into the furnace i only draw about 1 amp which is normal. I am pretty sure it is the board but i am not used to the american standard furnaces. It is a new american standard stage with reg motor. The main power coming in is good and polarity is good and properly grounded as far as i can see.
Well, as you know the blower comes on because there is a control voltage (24V) failure.
I would trace out all the 24V wiring with the schematic to make sure someone didn't cross up a wire.
Then ohm out each component to make sure there is not a bad part in the 24V cycle.
Make sure you have voltage going to the ignitor from the board.
Obviosly the draft inducer motor is working, so thats not the issue. However the pressure switch could be having problems, thus interupting the 24 V cycle.
If you have power to the ignitor, and no ignitor op, then the board is OK. If the board is not sending power to the ignitor, after recieving signal from the pressure switch, then the board is bad.
Make sure the pressure switch is closing, and sending signal to the board.
Posted on Jan 20, 2009
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