26
A2 -- DIAGNOSTIC CODES
Equipment Fault
Code Dis-
played on In-
door Unit
Front Panel
LED Display on Outdoor Unit Board
Possible C ause
Diagnostic Chart
Number
Green LED
Number of
Flashes
Red LED Number
of Flashes
Yellow LED
Number of
Flashes
Freeze Protection, Indoor Coil E2 4 3 Low Refrigerant Charge, Blocked Indoor 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 Temperatur e 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 Bad Connection, or Sensor Failure 31
Outdoor Coil Temperature Thermistor F4 5 Bad Connection, 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
Compressor Over Current Protection H4 6 High Ambient Temperature, or Loss of Condenser Airflow 33
IPM Module Protection H5 4 Loss of C ooling to Heat S ink, High Ambient, L ow Voltage, or Bad C onnections 34
38/40GXC(Q)
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