LG Multi V5 Service Manual page 194

ERROR CODES
Error No. 151, continued.
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.
Measure the four-way valve resistance.
Confirm the four-way valve coil is completely inserted.
194
Due to our policy of continuous product innovation, some specifications may change without notification.
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Location of the four-way valve connector on
the Main PCB (marked as "4way, CN09").
Check the output voltage of the terminal socket
during heating operation (output should be 230 V AC).