LG TN-C090BT00 Service Manual page 15

Troubleshooting Guide
VOLTAGE LIMITS
NAME PLATE RATING
380 - 415 V
1. No cooling and heating operation performed
1) Both the blower and the compressor do not work
WHAT TROUBLED
Other parts except the
unit
Magnetic switch for com-
pressor & fan motor
Operating switch
2) Only Indoor blowers do not work
WHAT TROUBLED
Motor
Capacitor
Electric wiring
COMPLAINTS
Electric supply interrupted
Defective power wiring
Cut off power fuse
Too low voltage
Control point is on condi-
tion of "OFF" due to trou-
ble.
Troubled or defective
contactor
COMPLAINTS
Over heated
Wiring short
Defected
Cut- OFF of wiring
Short circuited on
operation
MINIMUM
342 V
HOW TO CHECK
Measure power sypply
with a tester in case that
the same power source is
supplied to other equip-
ment except the unit,
what and where troubled
can be discovered by
checking the operation of
other equipment.
Measure it with a tester.
Make short-circuit, then
measure it with tester.
Check it with the eyes or
tester.
HOW TO CHECK
Check it with tester
Check it with a tester.
Check it with a tester.
15
MAXIMUM
456 V
REMEDY
Repair a switch box and
relative instrument.
Replacement of fuse
Request a power
supplier to repair.
Check the power source.
Use a thick cable if nec-
essary.
Replace it if necessary.
Repair or replace it.
REMEDY
Repair or replace it.
Replace it.
Rewiring or Repair.