GMV5 DC INVERTER VRF UNITS SERVICE MANUAL
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(6) Low voltage protection for the DC bus of the variable-frequency fan's drive board (ODU fault HL)
(7) Variable-frequency fan starting failure (ODU fault HJ)
The fan's drive board is
faulty and needs to be
replaced.
Check if the terminal
CN503 and CN504
on the fan's drive
board are connected.
Check if the voltage of the
input power cable is lower
than 320V
Elevate the voltage to
380V.
Check if the terminal CN503 and
CN504 on the fan's drive board
are connected.
Check if the fan's UVW
cable is connected properly.
Replace the fan's drive
board to see if the fault is
solved.
The fan is faulty and needs
to be replaced.
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