intensity VRF V5 Series Service Manual page 98

V5 X VRF 460V 60Hz
4.22 xF1 Troubleshooting
Digital display output
'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
 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
 Loosened wiring within electric control box.
 Power supply abnormal.
 Contactor damaged.
 Three-phase bridge rectifier damaged.
Procedure
xF1
Voltage between +15V and N pins of
inverter module voltage monitor port on
main PCB is abnormal
No
Voltage between P and N pins of inverter
module voltage monitor port on main
PCB is abnormal
96
Yes
1
Yes
2
 Reactor damaged.
 DC filter board damaged.
 Inverter module damaged.
 Main PCB damaged.
Wires between
inverter module
voltage monitor port
on main PCB and
voltage monitor port
on inverter module
are loose 3
Yes
Ensure the wires are
connected properly
Replace outdoor
main PCB
No
Replace the inverter module
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