Midea MV6-R252WV2RN1 - 2.30 CB1, CB2, CB3, CB4: Overmatch protection; 2.30.1 Digital display output; 2.30.2 Description; 2.30.3 Trigger; recover condition

V6R VRF 50Hz
144
Midea
V6R
Series Service Manual
2.30 CB1, CB2, CB3, CB4: Overmatch protection
Digital display output
Description
 CB1: VRF indoor exceeds the match range (the highest priority)
 CB2: AHU kit exceeds the match range (second highest priority)
 CB3: HT exceeds the match range (third highest priority)
 CB4: The total connection ratio exceeds the match range (the fourth highest priority)
 All units stop running.
 Error code is only displayed on the master unit.
Trigger / recover condition
 Trigger condition: the indoor unit connection ration exceeds the match table below.
 Recover condition: the indoor unit connection ration in the range of the match table.
 Reset method: Manually restart.
Table 6-2.1: Match table
IDU1
IDU2
IDU3
Total
connection
ratio A(%)
IDU1
connection
ratio B(%)
IDU2
connection
ratio C(%)
IDU3
connection
ratio D(%)
Note
VRF indoor
/
/
40 ≤ A ≤ X
1
40 ≤ B ≤ X
1
/
/
Connect at least
one VRF Indoor
HT
/
40 ≤ A ≤ 205
40 ≤ B ≤ X
1
C ≤ 105
/
/
AHU kit
40 ≤ A ≤ X
1
40 ≤ B ≤ X
1
/
C ≤ 65
AHU kit
/
/
40 ≤ A ≤ 115
/
/
D ≤ 115
Notes:
1. X is 205 for single outdoor unit system; X is 155 for 2 outdoor units combination system; X is 135 for 3 outdoor units combination units system
Possible causes
 Connection ratio does not meet the requirements.
Procedure
CB1, CB2, CB3, CB4
Change indoor unit connection ratio