165
Error Codes
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ERROR CODES
Please refer to the Safety Precautions on pages 4-7 for more detail to prevent injury or death regarding the operation and service
troubleshooting of the Multi V product.
WARNING
Error No. 51(2) (for Heat Recovery Systems only)
54
Error No. Description Details Causes
512
Master: 512
Total indoor unit
capacity exceeds
allowable heat
recovery unit
branch capacity
(Heat Recovery
Systems only).
Value of total indoor unit capacity
exceeds allowable heat recovery
unit branch capacity specifica-
tions. After auto-pipe detection
is complete, wait 5 minutes, then
verify connected capacity.
Total indoor unit capacity is
>54,000 Btu/h for each heat
recovery unit branch pipe.
1. Heat recovery unit port addresses are all unique, then
total indoor unit capacity is >54,000 Btu/h per each heat
recovery unit branch pipe.
2. Total indoor units connected to each heat recovery unit
branch pipe is > eight (8).
3. If 2 heat recovery unit port addresses are the same and
the ports are twinned; >108 Mbh total of multiple indoor
units are connected.
4. If 3 heat recovery unit port addresses are the same and
the ports are all connected, >162 Mbh total of multiple
indoor units connected.
5. If the total connected indoor unit nominal capacity ex-
ceeds 192 Mbh for a single heat recovery unit.
6. Wrong transmission cable / piping connections.
7. Outdoor unit and heat recovery unit PCB is defective.
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