The PC Error is thrown when the ambient temperature is too high, or too low for the unit to operate.
Low Ambient Protection (in cooling mode): The low ambient protection for cooling is parameter 40. The default settings is -1C. This means when the outside temperature drops to -1C or lower, the unit will no longer cool. This is adequate for most environments, but if you need cooling to work at lower temperatures you can lower this value.
- Unlock the controller (press the power button for 5 minutes)
- Press the program button (2nd from left) for 5 seconds... until the unit beeps.
- You will now see the #00 at the bottom (this is the parameter)
- You will also see the VALUE of the parameter in big numbers on the screen
- Use the UP/Down arrows to raise the parameter (the small number at the bottom) to 40
- Press the program button one time to enter EDIT MODE (the value will begin to blink)
- User the UP/Down arrows to set the desired value
- Press the program button one time to exit EDIT MODE.
- Press the power button one time to exit parameter mode.
Heating Mode
Low Ambient Temperature Protection: By default, the heat pump will not heat or cool when the ambient temperature is -30C or lower. This parameter setting should not be changed.
High Ambient Temperature Protection: By default, the heat pump will not heat or cool when the ambient temperature is 57C or higher. This parameter setting cannot be changed.