12LRN
3 – 6
[4] HOW TO OPERATE THE OUTDOOR UNIT INDEPENDENTLY
1. Cooling in 40 Hz fixed mode
To operate the outdoor unit independently, short-circuit the sections indicated by arrows in the diagram below with an adapter, and apply 220-240
VAC between (1) and (N) on the terminal board of the outdoor unit. This allows the outdoor unit to be operated in cooling mode independently.
(Do not operate the outdoor unit in this condition for an extended period of time.)
[5] GENERAL TROUBLESHOOTING CHART
1. Indoor unit does not turn on
2. Indoor unit fan does not operate
3. Indoor unit fan speed does not change
4. Remote control signal is not received
Main cause Inspection method Normal value/condition Remedy
Cracked PWB.
(Cracked pattern)
Check visually. There should be no cracking in
PWB or pattern.
Replace PWB.
Open-circuit in FU1
(250 V, 3.15 A)
Check melting of FU1. There should be no open-circuit. Replace PWB.
Main cause Inspection method Normal value/condition Remedy
Open-circuit in heat exchanger
thermistor (TH2) (in heating opera-
tion)
Measure thermistor resistance (dis-
mount for check).
CN8(1)-(2)
Replace thermistor.
There should be no open-circuit or
faulty contact.
Replace thermistor.
Disconnected heat exchanger ther-
mistor (TH2) (in heating operation)
Inspect connector on PWB.
Check thermistor installation condi-
tion.
Thermistor should not be discon-
nected.
Install correctly.
Main cause Inspection method Normal value/condition Remedy
Remote control is not designed to
allow fan speed change in several
operation mode.
Check operation mode. Fan speed should change except
during dehumidifying operation,
ventilation, light dehumidifying
operation, internally normal opera-
tion
Explain to user.
Main cause Inspection method Normal value/condition Remedy
Batteries at end of service life. Measure battery voltage. 2.5 V or higher (two batteries in
series connection)
Install new batteries.
Batteries installed incorrectly. Check battery direction. As indicated on battery compart-
ment.
Install batteries in indicated direc-
tion.
Lighting fixture is too close, or Fluo-
rescent lamp is flickering in the
room.
Turn off light and check. Signal should be received when
light is turned off.
Change light position or install new
fluorescent lamp.
Sevick light (Hitachi) is used in the
room.
Check room lights. Signal may not be received some-
times due to effect of Sevick light.
Replace light or change position.
Operating position/angle are inap-
propriate.
Operate within range specified in
manual.
Signal should be received within
range specified in manual.
Explain appropriate handling to
user.
Short both pads and energize.
PWB pattern side.
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