F1: Dc Bus Voltage Error - Midea VRF Series Service Manual

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
Replace the inverter module
Yes
No
Yes
No
Reconnect the reactor and DC bus wire
based on wiring diagram
Check the power supply equipment
V6R VRF 50/60Hz
97