Error No. 151 - 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
151
The difference
between the high
Master: 1511
and low pressure
Slave 1: 1512
is too low.
Slave 2: 1513
Is the four-way valve con-
nected properly?
Is the four-way
valve coil resistance normal
Is the four-way valve
coil connected to the four-way
valve correctly?
If there are more than
two outdoor units, does the
master outdoor unit recognize
all the slave units?
After power is reset
and heating mode begins,
can supply voltage be verified
at the PCB?
After the mode is
change from cooling to
heating or vice versa, does the
same error occur again?
Is the compressor operat-
ing normally?
Replace 4 way valve.
Details
Not enough pressure difference between high
and low. Function error of outdoor unit four-
way reversing valve.
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
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 CODES
1. Problem with four-way valve operation
because of sludge, inflow, etc.
2. No pressure difference because of
compressor error.
3. Defective four-way valve (resistance is not
Reconnect the four-way valve.
Change the four-way valve coil.
Re-insert four-way valve coil.
See Error No. 51.
Replace outdoor unit PCB.
Replace the four-way valve.
Check and replace compressor (magnet switch,
corresponding PCB, see electric components).
To get the valve to switch, close the outdoor unit hot gas service valve,
then put the system in heat mode, and if pressure builds, slowly open
the hot gas valve.

Error No. 151

Causes
193