I am trying to troubleshoot my AC, as it is not functioning at all. I thought the contactor was bad since it was not getting the 24V across and it looked a little rough. New contactor was installed and still no luck. I tested the transformer near the control board and found it to correctly output 24V to the board. So, then I tested the board and measure the voltage across the wires while the thermostat called for cooling. The board has the following wires:W Y G R C.
The 2 wires running to the outside unit (contactor) are W and C. When I measure directly on the boad with a lead on W and C, I get 0 volts (while the thermostat is calling for cool). If I measure across any of the wires, with a voltage lead on R, I get 28V.
Based on my logic, the transformer is good, the thermostat is functioning (and it functions just fine for heating), so I am leaning towards replacing the control board. There is not a fuse on the board or at the outside unit.
Can someone verify this seems logical and let me know if there is any other testing I should be doing before replacing the board? Thanks in advance!!
Furnace model: TUE1C100A9481AA
AC Condening Unit (2TTB3): 2TTB-SVN01A-EN
The 2 wires running to the outside unit (contactor) are W and C. When I measure directly on the boad with a lead on W and C, I get 0 volts (while the thermostat is calling for cool). If I measure across any of the wires, with a voltage lead on R, I get 28V.
Based on my logic, the transformer is good, the thermostat is functioning (and it functions just fine for heating), so I am leaning towards replacing the control board. There is not a fuse on the board or at the outside unit.
Can someone verify this seems logical and let me know if there is any other testing I should be doing before replacing the board? Thanks in advance!!
Furnace model: TUE1C100A9481AA
AC Condening Unit (2TTB3): 2TTB-SVN01A-EN
AC - Low Voltage Problem - Control Board?
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