Haier MRV II Instruction Manual page 123

[44/06]communication circuit between indoor and outdoor
if wiri ng between P and
Q is wr ong or broken down
if the port of CN15 on
indoor PCB is normal
if the port of CN19 on outdoor
connecting board is normal
if outdoor power source is normal
if power supply is failure
if there is noise
check outdoor PCB, if faulty, replace it
no
yes
yes
no
no
no
- 123 -
yes
modify the communication wire
no
modify the port
no
yes
electrify the outdoor
yes
clear the failure code
yes
check and eliminate noise
Part 3