69
Troubleshooting
Due to our policy of continuous product innovation, some specifications may change without notification.
©LG Electronics U.S.A., Inc., Englewood Cliffs, NJ. All rights reserved. “LG” is a registered trademark of LG Corp.
Error Code 'HVFULSWLRQ 'HWDLOV
Outdoor Unit
521
Communication error between outdoor unit main PCB
and inverter PCB.
• Communication error between main PCB and inverter PCB.
• Check connections at both sockets.
• Inspect interconnecting cable for wear.
531
Communication error between outdoor unit main PCB
and indoor unit(s) PCB.
• Check if outdoor unit to indoor unit(s) communications cable
has disconnected or short circuited.
• Check A terminals are connected to indoor unit A and 3 (5 on 3
x 3 cassette) terminals; B connect to B or 4 (6 on 3 x 3 cas-
sette) terminals.
571
Outdoor unit main PCB and inverter PCB communica-
tion error.
Outdoor unit inverter PCB is not receiving signal from main
PCB.
5 9 1 Outdoor unit series installation error. A smaller outdoor unit is set as the master outdoor unit.
6012XWGRRUXQLWLQYHUWHU3&%(3520HUURU
• 9HULI\WKH(3520LVSUHVHQWDQGLQWKHVRFNHWFRUUHFWO\
• Check if all pins are in and are not bent.
• Check if notch in the chip lines up with the arrow on the socket.
6 2 1 High temperature at the outdoor unit inverter heatsink.
System shut off because of high temperatures at the outdoor
unit inverter heatsink.
6 5 1 Outdoor unit inverter heatsink temperature sensor error.
Disconnection or short circuit of outdoor unit inverter heatsink
temperature sensor.
6 7 1 Outdoor unit fan has locked up. Outdoor unit air flow is restricted.
7 1 1 Outdoor unit converter CT sensor error. 0DVWHURXWGRRUXQLWLVUHVWULFWHG
7510DVWHURXWGRRUXQLWIDQ&7VHQVRUHUURU
Disconnection or short circuit of outdoor unit fan current detec-
tion (CT) sensor.
7 6 1 Outdoor unit fan DC link high voltage error. Outdoor unit fan DC link high voltage error.
7 7 1 Outdoor unit fan overcurrent error. Outdoor unit fan current is >10A (for 208-230V units).
7 9 1 Outdoor unit fan operation failure error. 2XWGRRUXQLWIDQLVH[SHULHQFLQJ¿UVWSRVLWLRQVHQVRUIDLOXUH
8 6 1 Outdoor unit PDLQ3&%RQERDUG(3520HUURU
• 9HULI\WKH(3520LVSUHVHQWDQGLQWKHVRFNHWFRUUHFWO\
• Check if all pins are in and are not bent.
• Check if notch in the chip lines up with the arrow on the
socket.
8712XWGRRUXQLWIDQ3&%(3520HUURU
• &RPPXQLFDWLRQHUURUEHWZHHQRXWGRRUXQLWIDQ0,&20DQG
(3520
• (3520LVPLVVLQJ
1 0 5 * Outdoor unit fan PCB communication error. Outdoor unit main PCB is not receiving a signal from the fan.
106*2XWGRRUXQLWIDQ,30HUURU ,QVWDQWRYHUFXUUHQWSHDNRIRXWGRRUXQLWIDQ,30
1 0 7 * Outdoor unit fan DC link low voltage error. Outdoor unit fan DC link voltage is <140V (for 208-230V units).
1 1 3 * Outdoor unit liquid pipe temperature sensor error.
• Check the connection at the socket on the outdoor unit PCB.
• Thermistor has disconnected or short circuited.
1 1 4 * Outdoor unit subcooling inlet temperature sensor error.
• Check the connection at the socket on the outdoor unit PCB.
• Thermistor has disconnected or short circuited.
1 1 5 * Outdoor unit subcooling outlet temperature sensor error.
• Check the connection at the socket on the outdoor unit PCB.
• Thermistor has disconnected or short circuited.
1 1 6 * Outdoor unit oil level sensor error. Disconnection or short circuit of outdoor unit oil level sensor.
Table 48: Outdoor Unit Error Codes, continued.
For detailed information on how to troubleshoot each error, see the Multi V S Service Manual on www.lg-vrf.com.
ERROR CODE TABLES
To Next Page
Loading...
Need help?
General
