On Board Diagnostics
Heat Pump Over Temperature Protection:
In HEAT PUMP Mode, or Heat Pump and Furnace
Mode, if the indoor coil reaches a temperature above
125°F (52°C), the display will flash both the HEAT
PUMP icon and either 99°F or 99°C on the display.
While Over Temperature Protection is activated, the
compressor will not run. It is recommended to increase
airflow by cleaning the filter and opening the vents.
Fault Codes
Display
Code
All
-- or FC
Models
F1
F2
Heat
F3
Pump
Models
F4
F5
F6
All
F7
Models
F8
49-5000400 Rev. 2
Fault Codes
Sensor
Signal Wire
Indoor Coil
Indoor Coil
Outdoor Coil
Outdoor Coil
Outdoor Temp
Outdoor Temp
Thermostat
Room Sensor
Thermostat
Room Sensor
Potential Cause
Thermostat Signal Wire is
unplugged or shorted (Not
communicating to the main
control)
Unplugged Sensor or Temp less
than -22°F (-30°C)
Shorted Wires or Temp greater
than 149°F (65°C)
Unplugged Sensor or Temp less
than -22°F (-30°C)
Shorted Wires or Temp greater
than 149°F (65°C)
Unplugged Sensor or Temp less
than -22°F (-30°C)
Shorted Wires or Temp greater
than 149°F (65°C)
Unplugged Sensor or Temp less
than -22°F (-30°C)
Shorted Wires or Temp greater
than 149°F (65°C)
11