Gree GMV6 DC Inverter VRF Units Service Manual
2.138 "U0" Insufficient Warm-up Time for Compressor
Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit
display
Fault diagnosis:
When the oil preheating period of time before compressor starts is less than eight hours, the unit
generates a fault.
Possible causes: --
Troubleshooting: Warm up the whole unit for more than eight hours before startup.
2.139 "U2" Incorrect Settings of Outdoor Unit Capacity DIP
Switch/Jumper Cap
Fault display: main board of outdoor unit, wired controller of indoor unit and receiver of indoor unit
display
Applicable models: all outdoor units
Fault diagnosis:
When the capacity DIP switch detected by the outdoor unit's main board is inconsistent with the unit's
actual capacity, or the jumper cap value detected by the outdoor unit's main board is inconsistent with
the actual unit, the fault is generated.
Possible causes:
■ Capacity DIP switch error or jumper cap error (for some models without jumper caps, jumper cap
error is not detected)
■ DIP switch or jumper cap is broken
■ Abnormal detection circuit
Troubleshooting:
"U2" Inco rrect Settings of
Outdoo r Unit Capaci ty DIP
Switch/Jumper Ca p
The detection circuit may
operate impro perly
Yes
Whether capacity DIP switch
on the main board and jumper cap are
consistent with the actual units?
No
Replace the main control
board
No
After the unit is powered
off, dial the DIP switch
again o r re place the jumper
cap and then power on the
unit again
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