Error No. 204 C - LG Multi V5 Service Manual

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
Communication
error between out-
Heat Recovery Unit door unit and heat
recovery unit.
1. If Error No. 59 is displayed on the heat recovery unit, and Error No. 204 is displayed on the outdoor unit, these indicate that the outdoor
unit software has NOT been upgraded to support heat recovery unit 3A models. Contact your LG representative for information.
2. Check power wiring and communication cable connections. Check if the green communication LED on the heat recovery unit PCB is
blinking.
3. If the green communication LED is blinking normally, check the rotary and DIP switch settings on the heat recovery unit (See Error No.
200). Reset the power to the outdoor and heat recovery units. (If there is a heat recovery unit communication error, it can't be released
until the power to the outdoor unit is reset.)
4. If the green communication LED of the heat recovery unit PCB is not blinking (on continuously), check if the communication of the total
indoor units is normal (See Error No. 05). If the green communication LED of the heat recovery unit PCB is not blinking (on continuously),
and even if communication to the indoor unit is functioning, replace the heat recovery unit PCB.
DANGER
• High voltage electricity is required to operate this system. Adhere to the NEC code and these instructions when wiring. Improper connec-
tions and inadequate grounding can cause accidental injury or death.
• Turn the power off before servicing the equipment. Electrical shock can cause physical injury or death.
• Do not operate the disconnect switch with wet hands. There is risk of fire, electric shock, physical injury or death.
WARNING
• Disconnects must only be performed by a properly licensed electrician. Incorrect wiring could cause the disconnect to explode, leading to
physical injury or death.
• Do not operate the unit with the panel(s) or protective cover(s) removed. The hot, cold, and high-voltage parts of the unit can cause
physical injury or death.
• Do not touch the refrigerant piping during or after operation. It can cause burns or frostbite.
• If the power wiring and communication cables on the heat recovery unit(s) and indoor unit(s) are not properly connected (connections
switched), the communication components will burn out.
• Do not supply power to the unit until all electrical wiring and controls wiring are completed.
Heat Recovery Unit PCB
No. 1 Valve Housing
SW02M
DIP switch for setting up
Heat Recovery Unit functions.
Details
Outdoor unit does not receive signal
from heat recovery unit.
No. 4 Valve Housing
SW04M
SW03M
Due to our policy of continuous product innovation, some specifications may change without notification.
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ERROR CODES
1. Heat recovery unit power wiring and / or communi-
cation cable connections are defective.
2. Heat recovery unit rotary or DIP switch setting(s) is
(are) wrong.
3. Defective heat recovery unit communications PCB
(sub PCB).
4. Defective heat recovery unit main PCB.
Images here are representative of system components.
Actual component appearance depends on model and
system type.
SSD
SW05M
SW01M
SW01M / SW03M / SW04M
Switches for manual valve
addressing.

Error No. 204 C

Causes
203