H2, H3: Qty. Of Outdoor Unit Decreases/ Increases Error - Midea VRF Series Service Manual

V6R VRF 50/60Hz

2.13 H2, H3: Qty. of outdoor unit decreases/ increases error

Digital display output
Description
 H2 indicates Qty. of outdoor unit decreases error.
 H3 indicates Qty. of outdoor unit increases error.
 All units stop running.
 Error code is only displayed on the master unit.
Trigger / recover condition
 Trigger condition: Qty. of slave units detected by master unit has decreased or increased.
 Recover condition: Qty. of slave units detected by master unit goes back to normal.
 Reset method: Resume automatically.
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 outdoor main PCB or electric control box communication terminals block.
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