MCAC-UTSM-2009-03 Troubleshooting
Outdoor Units 31
4. Timer lamp flash at 5Hz
In-outdoor unit communication malfunction
Judge 1: Check whether the wiring of communication line is break off
Yes
Connect the wiring well
Judge 2: Check whether the wiring of L, N and S is wrong
No
Connect the wiring of L, N and S rightly
Replace the PCB
Yes
No
Timer flash at 5Hz
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