Air-cooled Package DM13-01.01.16en
40 Service manual
Operation lamp flashes:
No
Yes
No
Yes
All lamps flashing at 5Hz
Judge 1: The PRO terminal on PCB of indoor unit without connecting to grounding wire
Validate: Check whether the PRO terminal on PCB of indoor
unit without connected to grounding wire.
Connect it to grounding wire.
Judge 2: Optical coupler on PCB malfunction
Validate: Check whether the Optical coupler is normal.
Replace optical coupler
Replace indoor PCB.
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