Gree GMV6 DC Inverter VRF Units Service Manual
2.90 "HJ" Inverter Fan Startup Failure
Fault display: main board of outdoor unit displays
Fault diagnosis:
If the fault code displayed on the 2-digit digital LED of the outdoor unit's main control board is HJ, it
indicates the inverter fan startup failure.
Possible causes:
■ Poor contact of fan's UVW cables;
■ The fan is damaged;
■ The blades are stuck (the blades are blocked or the motor shaft gets rusty);
■ The fan drive board operates improperly.
Troubleshooting:
"HJ" Inve rter Fan Startup
Failure
The fan drive board is
abnormal
Yes
Replace th e fan drive board
No
Whether the U, V and W p hases of fan
wires a re con nected properly?
Yes
No
Replace the fan
Whether the resistance between
the windings of each phase for the fan is normal
(generally less than 10 ohms)? Whether the resistance values
are equal to each other? Is grounding insulation of the phase
windings of the fan normal (generally greater
than 2 megohms)?
Yes
Yes
Remove foreign matters
Whether blades
are stuck due to foreign matter s or rusting
of motor shaft
?
Yes
Yes
Replace the faulty fan
Have other faults
occurred at the same time (fo r ex am p le ,
over-current protection (H5), IPM module
protection (H6), loss of synchronization
for fan (H9))?
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