R410A Full DC Inverter Split Duct Type Technical Manual MCAC-UTSM-201503
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8. Trouble shooting
8.1 Outdoor unit malfunction and protection codes
Indoor & outdoor unit communication error
Ambient temperature T4/pipe temperature T3 sensor
error
Outdoor unit address is wrong
IR341 and main control chip communication error
0537 and main control chip communication error
Three times P6 protection in 60 minutes
Three times P2 protection in 60 minutes
Three times P4 protection in 100 minutes
High pressure sensor error
Discharge pressure less than or equal to 0.3MPa
Three times P9 protection in 60 minutes
Top temperature protection of compressor
Display H6, if three times in 100 minutes
High pressure protection or high temperature protection
of discharge sensor
Display H5, if three times in 60 minutes
Over-current protection of compressor
Discharge temperature protection
Display H6, if three times in 100 minutes
Pipe temperature protection
Inverter module protection
Display H4, if three times in 60 minutes.
Display H9, if three times in 60 minutes
DC generatrix low voltage error
DC generatrix high voltage error
MCE error/ synchronization/ closed loop
Frequency difference in one second more than 15Hz
protection
Frequency difference between the real and the setting
frequency more than 15Hz protection