F7: Main Power Off (For Ms01) - Midea VRF Series Service Manual

3.9 F7: Main power off (for MS01)

Digital display output
Description
 Main power off.
 All units stop running.
 Error code is displayed on the malfunction MS box.
 The indoor unit display board or wired controller connected to this MS displays "F8".
Trigger / recover condition
 Trigger condition: MS main power off, and UPS power is ON.
 Recover condition: MS main power on, and UPS power is OFF.
 Reset method: Resume automatically.
Possible causes
 Abnormal power supply.
 The power supply wiring is loose.
 MS PCB damaged.
Procedure
Main power supply shut off.
The power supply wiring is loose.
Replace the MS main PCB
F7
No
No
Yes
Provide normal power supply.
Yes
Ensure the wires are connected properly.
V6R VRF 50/60Hz
159