84
U-Match Series DC
Inverter Service Manual
ƹ
E4 Discharge Protection
E4 protection
Check if the discharge
temperature around
compressor discharge
temperature sensor
exceeds 115ć
No
Yes
Check if the
discharge
temperature sensor
is normal
Check if there is leakage in the
system pipeline; weld the
leakage point and recharge
refrigerant after vacuum
pumping and pressure retaining
are passed
Yes
Replace the outdoor
main control board
No
Replace the discharge
temperature sensor
ƹ
E6 Communication Malfunction
Communication
malfunction
Check if the
communication wire between
indoor unit and outdoor unit is
connected well
Check if there is
open circuit in the communication
wire between indoor unit and
outdoor unit
Reconnect the
communication
wire
Replace the
communication
wire
Check if the
outdoor unit is energized
Energize the
outdoor unit
Replace the mainboard
Yes
Yes
No
No
No
Yes
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