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26
A2 -- DIAGNOSTIC CODES
Equipment Fault
Code Dis-
played onIn-
door Unit
Front Panel
LED Display onOutdoor Unit Board
Possible C ause
Diagnostic Chart
Number
GreenLED
Number of
Flashes
Red LEDNumber
of Flashes
Yellow LED
Number of
Flashes
Freeze Protection, Indoor Coil E2 4 3 Low RefrigerantCharge, BlockedIndoor Air Flow, or Dirty Air Filter 28
High Compressor Discharge Temperature E4 7 Low Refrigerant Charge, or Blocked Capillary 29
Low Voltage Protection E5 5 Low Voltage NR
Communication Error E6 0 Wiring Error, or Communication Failure 30
Indoor Air Temperature Thermistor F1 Bad Connection, or Sensor Failure 31
Indoor Coil Temperature Thermistor F2 Bad Connection, or Sensor Failure 31
Outdoor Air Temperature Thermistor F3 6 BadConnection, or Sensor Failure 31
Outdoor Coil Temperature Thermistor F4 5 BadConnection, or Sensor Failure 31
Compressor Discharge Line Thermistor F5 7 Bad Connection, or Sensor Failure 31
High Condensing Temperature H3 8 High Ambient Temperature, or Loss of Condenser Airflow 32
CompressorOver Current Protection H4 6 High Ambient Temperature, or Loss of Condenser Airflow 33
IPM Module Protection H5 4 Loss of Cooling to Heat Sink, High Ambient, Low Voltage, or Bad Connections 34
38/40GXC(Q)