Midea MV6-R252WV2RN1 - 3.7 H0: Communication between master and slave control boards failed (for MS04-12); 3.7.1 Digital display output; 3.7.2 Description; 3.7.3 Trigger; recover condition

V6R VRF 50Hz
156
Midea
V6R
Series Service Manual
3.7 H0: Communication between master and slave control boards failed (for MS04-12)
Digital display output
Description
 H0 indicates a communication error between master and slave MS PCB.
 All units stop running.
 Error code is displayed on the malfunction MS box.
Trigger / recover condition
 Trigger condition: the communication between MS’s master PCB board and slave PCB is abnormal for 2 minutes.
 Recover condition: Communication go back to normal.
 Reset method: Resume automatically.
Possible causes
 Loosened communication wiring from the master PCB to the slave PCBs.
 MS PCB damaged.
 Salve MS has power off.
Procedure
H0
Communication wire from the master
PCB to the slave PCB is loosened.
Yes
Reconnect the communication wire.
No
Slave MS has power off.
Yes
Check the power supply circuit.
No
Replace the MS main PCB