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12PHR-N
[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 ap-
ply 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
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.
2. Indoor unit fan speed does not change
Main cause
Inspection method
Normal value/condition
Remedy
Open-circuit in heat exchanger
thermistor (TH2) (in heating
operation)
Measure thermistor resistance
(dismount for check).
-1
Replace thermistor.
There should be no open-circuit
or faulty contact.
Replace thermistor.
Disconnected heat exchanger
thermistor (TH2) (in heating
operation)
Inspect connector on PWB.
Check thermistor installation condi-
tion.
Thermistor should not be discon-
nected.
Install correctly.
3. Indoor unit fan speed does not change
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, self clear, full power.
Explain to user.
4. Remote control signal is not received
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
compartment.
Install batteries in indicated
direction.
Lighting fixture is too close, or
Fluorescent 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
inappropriate.
Operate within range specified in
manual.
Signal should be received within
range specified in manual.
Explain appropriate handling to
user.
Open-circuit or short-circuit in wir-
ing of light receiving section.
Check if wires of light receiving
section are caught.
Wires of light receiving section
should not have any damage
caused by pinching.
Replace wires of light receiving
section.
PWB PATTEN SIDE
Short both pads and energize.
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