Gree GMVVQ1015WM/C-X, Service Manual

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Gree GMV6 HR DC Inverter VRF Units Service Manual
162
2.99 "H5" Inverter Fan Over-current Protection
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 H5, it
indicates the over-current protection for the inverter fan.
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:
"H5" Inve rte r Fan
Over-current Protection
The fan dr ive boa rd is
abn ormal
Yes
Replace th e fan drive board
No
Whether th e U, V and W p hases of fan
wires a re con nected pro perly?
Yes
No
Replace th e 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 forei gn matters
Whether blad es are stuck
due to fore ign ma tters o r ru sting
of motor sh aft?
Yes
Yes
Replace th e faulty fan
Have o the r faults
occurred at the same time (for e xa mpl e,
fan startup fai lure (HJ), IPM modu le p rote ction
(H6) and loss o f synchron iza tion
for fan (H9))?