Midea MV5-X252W/V2GN1 - 4.23 xF1 Troubleshooting; 4.23.1 Digital display output; 4.23.2 Description; 4.23.3 Possible causes

V5 X VRF 50/60Hz
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Midea V5 X Series Service Manual
4.23 xF1 Troubleshooting
Digital display output 4.23.1
'x' is a placeholder for the compressor system (compressor and related electrical components), with 1 representing
compressor system A and 2 representing compressor system B.
Description 4.23.2
 1F1 indicates compressor A DC bus voltage error.
 2F1 indicates compressor B DC bus voltage error.
 When the DC bus voltage is outside the range 300-800V continuously for 10 seconds, the system displays the F1 error
code and all units stop running.
 Error code is only displayed on the unit with the error.
Possible causes 4.23.3
 Loosened wiring within electric control box.
 Power supply abnormal.
 Contactor damaged.
 Three-phase bridge rectifier damaged.
 Reactor damaged.
 DC filter board damaged.
 Inverter module damaged.
 Main PCB damaged.
Procedure 4.23.4
xF1
Voltage between +15V and N pins of
inverter module voltage monitor port on
main PCB is abnormal
1
Yes
Wires between
inverter module
voltage monitor port
on main PCB and
voltage monitor port
on inverter module
are loose
3
No
Replace the inverter module
Yes
No
Ensure the wires are
connected properly
Voltage between P and N pins of inverter
module voltage monitor port on main
PCB is abnormal
2
Yes
Replace outdoor
main PCB
Flowchart continued on next page …