12 Specifications subject to change without notice. IM-KSAIC03-02
ERROR CODES
For ease of service, the 24V Interface is equipped with a diagnostic code display LED on the control board (ensure the 24V interface is installed
with the directional arrow pointing up to successfully read the error code). Refer to the indoor or outdoor unit’s service manual as listed in
Table 16 for a troubleshooting breakdown.
Table 16 — Error Codes
Display Malfunction and Protection Indication Service Manual Reference
E0 Indoor EEPROM error Indoor Service Manual
E2 Cross-zero detection error Indoor or Outdoor Service Manual
E3 Indoor fan speed malfunction Indoor Service Manual
E4 Indoor room temperature sensor error Indoor Service Manual
E5 Evaporator coil temperature sensor error Indoor Service Manual
EC Refrigerant leak detection system malfunction Indoor or Outdoor Service Manual
F0 Current overload protection Outdoor Service Manual
F1 Outdoor ambient temperature sensor (T4) malfunction Outdoor Service Manual
F2 Condenser coil temperature sensor (T3) malfunction Outdoor Service Manual
F3 Condenser coil temperature sensor (T5) malfunction Outdoor Service Manual
F4 Outdoor unit EEPROM parameter error Outdoor Service Manual
F5 Outdoor fan speed has been out of control Outdoor Service Manual
F6 T2b sensor error Indoor or Outdoor Service Manual
P0 Inverter module (IPM) malfunction Outdoor Service Manual
P1 Over-voltage or under-voltage protection Outdoor Service Manual
P2 Compressor top high temperature protection (OLP) Outdoor Service Manual
P3 Low ambient temperature cut off in heating Outdoor Service Manual
P4 Compressor drive malfunction Outdoor Service Manual
-- Mode conflict Indoor Service Manual
P6 Compressor low-pressure protection Outdoor Service Manual
IN 24V Interface and indoor unit communication malfunction Indoor Service Manual (E1)
0U 24V Interface (indoor unit) and outdoor unit communication malfunction Indoor Service Manual (E1)
00 24V Interface successful power up and in standby Operational Code
01 System operating in cooling mode Operational Code
02 System operating in heating mode Operational Code
03 System operating in fan mode Operational Code
04
System operating in dehumidify mode (not a recommended application for
FV4C units)
Operational Code
05 System operating with Auxiliary heater active (not a recommended application) Operational Code
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