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Diagnostic procedure for check code
Check code
[88]
Communication alarm between Multi Controller
and outdoor unit
Check lead connection between indoor unit and Multi Controller.
If no error is detected, replace Multi Controller board (MCC-1210) or outdoor PC board (MCC-1223).
Check code
[89]
Indoor over capacity
Is No. of connected indoor
units acceptable? (*1)
Yes
Is set-up of indoor unit
horse power correct? (*2)
Yes
Is total capacity of
connected indoor units
within indoor unit diversity?
1. M/C = 135%
2. 4 M/C = 160%
Yes
Check IPDU PC board
(*1)
Number of
Maximum No. of Indoor unit diversity Maximum system code Maximum code per
Multi Controllers indoor units
1
4
2
8
3
12
4
16
(*2)
Indoor unit
Capacity
Code number
(Example: Model RAV-364UH-PE, capacity = 36)
50
Troubleshooting
No
No
No
135%
160%
No connection
10
0
2
Operation cause
1. Error connection between Multi Controller
and outdoor unit.
2. Outdoor PC board error (MCC-1223).
3. Multi Controller PC board error (MCC-1210).
4. Multi Controller does not recognise outdoor
capacity.
Operation cause
1. No. of connected indoor units/connected over
capacity.
2. Incorrect set-up of indoor unit horse power or
set to 0.
Indoor units from another system have been
Modify miswiring/installation.
Modify set-up of horse power.
Keep capacity of connected indoor units
27
32
13
16
20
3
4
5
incorrectly connected.
within unit diversity.
Multi Controller
27
27
27 (13*)
13
26
36
46
6
8
10
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