335
Troubleshooting
Alarm code is displayed on the master controller/ the 7-segment of O.U. display PCB / the 7-segment of I.U. PCB1.
★
PSH is activated 6 times in one hour the alarm occurs.
Alarm
Code
Activation of the safety device (high pressure switch) in the outdoor unit
Is it connected to PCN8 of main PCB?
Plug PCN8 correctly.
Is there continuous input between terminals
of PCN8 during operation stop?
Faulty
O.U. main PCB
Is faston terminals for
PSH connected to PSH
correctly?
Plug faston terminals
to PSH correctly.
Yes
No
No
No
Yes
Yes
Faulty
O.U. main PCB
Check activation of the
following safety
devices.Remove the cause
after checking.
PSH：4.4MPa(R32)
1.2.3.1
Troubleshooting by Alarm Code (O.U.)
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