LG Multi V5 Service Manual page 200

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
WARNING
troubleshooting of the Multi V product.
Error No. Description
Capacity of indoor
units connected to
the heat recovery
Heat Recovery Unit
unit exceeds
allowable limits.
1. If viewed from the master outdoor units SSD: The display shows "51c" where "c" is the heat recovery unit count number of the overcon-
nected device assigned by auto-pipe detect.
2. If viewed from the heat recovery unit PCB board display that is overconnected: The display will show "CH51".
3. If viewed from an heat recovery unit that is not overconnected: The display will show nothing.
4. If viewed from any indoor unit zone controller: Nothing will be displayed.
5. If viewed from LGMV maintenance software on a PC: The screen will show CH51h where "h" is the heat exchanger address of the over-
connected heat recovery unit.
1. Check if the communication cable and piping between the heat recovery unit(s) and the indoor unit(s) installed correctly.
2. Check if the DIP switches are set correctly for each connection condition between the heat recovery unit(s) and the indoor unit(s).
3.
4.
kBtu (including zoning control).
5. If the error occurs again even after following Steps 1 through 4 above, replace the corresponding heat recovery unit PCB.
6. When Steps 1 through 4 (or Steps 1 through 5 if the heat recovery unit PCB needs to be replaced) are completed successfully, perform
the auto addressing and piping detection procedures.
200
Details
Total capacity of indoor unit(s)
connected to each heat recovery
unit port exceeds allowable limits.
Error code displays on the outdoor
unit SSD, the heat recovery unit
SSD, or in LGMV.
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Causes
After auto-pipe detection is complete, wait 5 minutes, then
verify connected capacity. System will display error if:
• The heat recovery unit port addresses are all unique,
then >54 Mbh single indoor unit connected; >54 Mbh total
of multiple indoor units connected.
• If 2 heat recovery unit port addresses are the same and
the ports are twinned; >108 Mbh total of multiple indoor
units are connected.
• If 3 heat recovery unit port addresses are the same and
the ports are all connected, >162 Mbh total of multiple
indoor units connected.
• If the total connected indoor unit nominal capacity ex-
ceeds 192 Mbh for a single heat recovery unit.
1. Communication cable or piping is not connected prop-
erly.
2. Heat recovery PCB DIP switch is not set correctly.
3. The indoor unit connected on the heat recovery unit port
exceeds the allowable capacity limit.