Question about Heating & Cooling
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.
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.
Posted on Jan 20, 2009
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Posted on Jan 02, 2017
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