Midea MV5-X252W/V2GN1 Service Manual page 67

V5 X VRF 50/60Hz
4.10 H2, H3 Troubleshooting
4.10.1 Digital display output
4.10.2 Description
 H2 indicates that the number of slave units detected by master unit has decreased.
 H3 indicates that the number of slave units detected by master unit has increased.
 All units stop running.
 Error code is only displayed on the master unit.
4.10.3 Possible causes
 Some outdoor units are powered off.
 Power supply abnormal.
 Incorrect outdoor unit address setting.
 Communication wires between outdoor units not connected properly.
 Loosened wiring within electric control box.
 Damaged main PCB or electric control box communication terminals block.
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