I have two York Affinity 5T 15 SEER Heat Pump units in the house. One is for downstairs and another one is for upstairs. Both units don’t work properly sometimes.
For the upstairs unit: The outdoor unit (both fan and condenser) does not run sometimes. I checked the two lights on the electrical board inside outdoor unit. The red light is off, and the green light was flashing continuously. There is no fault code for this red light and green light combination. Turning-off and turning-on (many times) the heat pump with thermostat might restart the outdoor unit. Normally this problem happens when the power voltage is relative low and the humidity is high. Does any person know what the reason of this problem is?
For the downstairs unit: The outdoor unit (both fan and condenser) does not run sometimes neither. I check the fault code from the two lights on the electrical board inside the outdoor unit. The fault code is “High Discharge Line Temperature”. Resetting the protection lock will not restart the outdoor unit in this case. I found the outdoor unit fan was running slow when it is cold outside (frozen), and I didn't see this outdoor unit running at the de-frozen mode (steam out of the unit) often. Does any person know what the reason of this problem is?
I have asked the tech who did the maintenance services for these two units. He has no idea about these problems, and he is from the dealer I found from York AC website.
Thank you in advance.