Upon arrival customer told me he turned the ac on Monday or Tuesday and tried to turn on the heat Yesterday and nothing came on. I went to the condenser and had 24 volts threw R and C Calling for cooling I had 24v threw Y and C but nothing pulling in the contactor. Calling for heating I 24 Volts threw O and C but nothing pulling in the contactor. I checked the 2 wires coming from the board to each side going to the contactor and I don’t have 24 volts. I pushed the pins on the board and no change I found a bad defrost board. Please look up to see if it is under warranty and price and Availability.