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Technical Information
Replace the mainboard
YES
E4 Discharge Protection
Check if thre is a leakage in the
system pipeline; weld the leakage
point and recharge refrigerant after
vacuum pumping and pressure
retaining are passed
E4 protection
Check if the discharge temperature
around compressor discharge
temperature sensor exceeds
115ºC (239ºF)
YES
Check if the discharge
temperature sensor is
normal
Replace the discharge
temperature sensor
Replace the outdoor
main control board
E6 Communication Malfunction
Check if the
outdoor unit is energized
Communication malfunction
Check if the
communication wire between
indoor unit and outdoor unit is
connected well
YES
Reconnect the
communication wire
Energize the
outdoor unit
Replace the
communication wire
Check if there is
open circuit in the communication
wire between indoor unit and
outdoor unit
NO
Summary of Contents for AC Pro C Series
Page 90: ...Technical Information...
