Midea V6 Series Service Manual page 110

2.16 H7: Unmatched total number of indoor units
2.16.1 Digital display output
2.16.2 Description
 Number of indoor units detected by master unit not same as number set on main PCB.
 All units stop running.
 Error code is only displayed on the master unit.
2.16.3 Trigger / recover condition
 Trigger condition: Only one indoor unit cannot be detected by master unit for 8 hours or more than one indoor unit
cannot be detected by master unit for 3 minutes.
 Recover condition: Number of indoor units detected by master unit is same as number set on main PCB.
 Reset method: Resume automatically.
2.16.4 Possible causes
 Number of indoor units set on main PCB not same as actual number of indoor units.
 Some indoor units are powered off.
 Communication wires between indoor and outdoor units not connected properly.
 Indoor unit PCB damaged.
 Indoor unit without address or indoor unit address duplicated.
 Main PCB damaged.
V6 VRF 50Hz
109