LG Multi V5 Service Manual page 134

ERROR CODE TABLES
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.
Table 76: Error Codes, continued.
Error Code
Master outdoor unit upper heat exchanger temperature
1 5 3 1
sensor error.
Slave1 outdoor unit upper heat exchanger temperature
1 5 3 2
sensor error.
Slave2 outdoor unit upper heat exchanger temperature
1 5 3 3
sensor error.
Master outdoor unit lower heat exchanger temperature
1 5 4 1
sensor error.
Slave1 outdoor unit lower heat exchanger temperature
1 5 4 2
sensor error.
Slave2 outdoor unit lower heat exchanger temperature
1 5 4 3
sensor error.
Communication error between master outdoor unit
1 8 2 1
external board main and sub MICOMs.
Communication error between slave1 outdoor unit
1 8 2 2
external board main and sub MICOMs.
Communication error between slave2 outdoor unit
1 8 2 3
external board main and sub MICOMs.
1 8 7 1
1 8 7 2
Hydro kit P, HEX error (P equals prevents from freez-
ing).
1 8 7 3
Excessive increase in master outdoor unit fan heatsink
1 9 3 1
temperature.
Excessive increase in slave1 outdoor unit fan heatsink
1 9 3 2
temperature.
1 9 3 3 Excessive increase in slave2 outdoor unit fan heatsink
temperature.
Master outdoor unit fan heatsink temperature
1 9 4 1
sensor error.
1 9 4 2 Slave1 outdoor unit fan heatsink temperature
sensor error.
Slave2 outdoor unit fan heatsink temperature
1 9 4 3
sensor error.
134
Description
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Details
• Check the connection on the outdoor unit PCB.
• Thermistor shorted or opened.
• Check for 12 V DC between 12 V and GND (red to black) for
5 V DC.
• Check the Signal to GND (white to black) and use correct chart
from Troubleshooting section to compare with actual system
temperature.
Master outdoor unit external board main to sub MICOMs
communication failure.
Slave1 outdoor unit external board main to sub MICOMs
communication failure.
Slave2 outdoor unit external board main to sub MICOMs
communication failure.
• Inlet water temperature is <5°C (41°F). Raise error code –
Level 3 response.
• Water outlet temperature sensor is disconnected or shorted.
• Prevents HEX from bursting (from freezing) when operating.
Does not protect HEX if the glycol is inadequate, nor if the
hydro kit is off and not operating.
Outdoor unit compressor ramps up, and hydro kit operates. One
(1) minute later, pipe temperature at mid-temperature hot water
supply (inlet or outlet water) is <0°C (32°F), and mid-tempera-
ten (10) seconds.
• System has shut off because outdoor unit fan heatsink tem-
perature is >203°F.
• Check the connection on the outdoor unit PCB.
• Thermistor shorted or opened.
• Check for 12 V DC between 12 V and GND (red to black) for
5 V DC.
• Check the Signal to GND (white to black) and use correct chart
from Troubleshooting section to compare with actual system
temperature.
• Check the connection on the outdoor unit PCB.
• Thermistor shorted or opened.
• Check for 12 V DC between 12 V and GND (red to black) for
5 V DC.
• Check the Signal to GND (white to black) and use correct chart
from Troubleshooting section to compare with actual system
temperature.