Midea VRF Series User Manual

V6R VRF 50/60Hz
97
Part
6
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Diagnosis and Troubleshooting
2.9 F1: DC bus voltage error
Digital display output
Description
 All units stop running.
 Error code is displayed on the unit with the error.
Trigger / recover condition
 Trigger condition: DC bus voltage < 300V or DC bus voltage >800V continuously for 10 seconds.
 Recover condition: DC bus voltage goes back to normal.
 Reset method: Restart automatically.
Possible causes
 Loosened wiring of the compressor inverter module.
 Incorrect wiring of the reactor and DC bus wire.
 Abnormal power supply.
 Inverter module damaged.
Procedure
F1
Reactor and DC bus wiring is incorrectly
The power supply is abnormal
No
No
Replace the inverter module
Yes
Reconnect the reactor and DC bus wire
based on wiring diagram
Check the power supply equipment
Yes

Midea VRF Series Specifications

General

Compressor Type	Inverter Scroll Compressor
Type	Variable Refrigerant Flow (VRF)
Refrigerant	R410A
Control	Centralized control, individual control
Indoor Unit Types	Wall mounted, cassette, ducted, floor standing
Energy Efficiency	High energy efficiency with DC inverter technology
Indoor Unit Noise Level	19 dB(A) to 45 dB(A)