39
Maintenance
7.6 Indoor unit error codes
Error code Description Possible causes
E0 Mode conflict
– The operating mode of the indoor unit clashes
with that of the outdoor units.
E1
Communication error between indoor and
outdoor units
– Communication cables between indoor and
outdoor units are not connected properly.
– Interference from high voltage wires or other
sources of electromagnetic radiation.
– Communication cable too long.
– Main PCB is damaged.
E2 Internal air temperature sensor error (T1)
– Temperature sensor not connected properly or
has malfunctioned.
– Main PCB is damaged.
E3
Internal heat exchanger temperature
midpoint sensor error (T2)
E4
Internal heat exchanger leaving temperature
sensor error (T2B)
E6 Fan error
– Fan jammed or obstructed.
– Fan motor not connected properly or has
malfunctioned.
– Power supply abnormal.
– Main PCB is damaged.
E7 EEPROM error
Eb Internal EEV coil error
– Loose or broken line.
– The electronic expansion valve has jammed.
– Main PCB is damaged.
Ed Outdoor unit faulty – Outdoor unit error.
EE Water level alarm malfunction
– The water level float is stuck.
– The water level switch is not connected
correctly.
– Main PCB is damaged.
– The drain pump has malfunctioned.
FE No address assigned to the indoor unit – No address assigned to the indoor unit.
A1 * Refrigerant leak
A0 * Emergency stop
F7+
repeated
address *
Multiple indoor units with the same address
U4 * MS box self-diagnosis error
F8 * MS box error
NOTES:
(*) only for V6R systems
Fast flash = 0.5 s
Slow flash = 1 s
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