3-7
12PHR-N
Main cause
Inspection method
Normal value/condition
Remedy
Light receiving unit is defective
Check signal receiving circuit
(measure voltage between termi-
nals 8 and 10 or 9 and 10 of con-
nector CN17).
Tester indicator should move when
signal is received.
Replace PWB.
Dew condensation on light
receiving
unit.
Check for water and rust.
Signal should be received within
range specified in manual.
Take moisture-proof measure for
lead wire outlet of light receiving
section.
5. Louvres do not move
Main cause
Inspection method
Normal value/condition
Remedy
Caught in sliding section.
Operate to see if louvres are caught
in place.
Louvres should operate smoothly.
Remove or correct catching sec-
tion.
Disconnected connector (CN13,
CN16, CN19) on relay PWB, louver
motor side)
Inspect connectors.
Connectors or pins should not be
disconnected.
Install correctly.
Contact of solder on PWB
(Connector section on PWB)
Check visually.
There should not be solder contact. Correct contacting section.
6. There is noise in TV/radio
Main cause
Inspection method
Normal value/condition
Remedy
Grounding wires not connected
properly.
Check grounding wire connections.
Grounding wires should be
connected properly.
Connect grounding wires properly.
TV/radio is placed too close to out-
door unit.
Check distance between TV/radio
and outdoor unit.
If TV/radio is placed too close, it
may become affected by noise.
Move TV/radio away from outdoor
unit.
Other than above.
Check for radio wave interference.
7. Malfunction occurs
Main cause
Inspection method
Normal value/condition
Remedy
Malfunction caused by noise.
Check for radio wave
interference.
8. Compressor does not start
Main cause
Inspection method
Normal value/condition
Remedy
Erroneous inter-unit connection.
Check wiring between indoor and
outdoor units.
Terminal board 1-N: 220-240
VAC, 50 Hz
Terminal board 2: serial signal
Correct wiring.
Damaged IPM.
Check IPM continuity.
See [IPM check method] on page
3-10
Replace IPM.
Dried-up electrolytic capacitor.
Check electrolytic capacitor.
See [Inverter electrolytic capacitor
(C9,C10) check method] on page
3-9
Replace electrolytic capacitor.
Blown outdoor unit fuse. .
Check 20A fuse.
Check 15A fuse.
Fuse should not be blown.
Replace fuse/diode bridge.
Replace fuse.
Replace outdoor unit PWB
assembly
Power supply voltage is too low.
Measure power supply voltage dur-
ing startup.
230±10 VAC, 50 Hz
Make sure that power supply
voltage is 200 V or higher.
Compressor lock.
•
Temp. fuse of terminal is error
•
EEEPROM error
•
AC Over current error
Supply current and touch compres-
sor cover (sound absorbing materi-
al) to check if operation starts.
See (Diagnosis Function and dis-
play mode) on page 3-13
Compressor should start normally.
Malfunction display section (0-0)
Compressor should start normally.
Apply external impact to
compressor.
Replace compressor.
•
Replace terminal
•
Replace outdoor unit PWB
•
Replace outdoor unit PWB
9. Operation stops after a few minutes and restarts, and this process repeats
Main cause
Inspection method
Normal value/condition
Remedy
Dried-up electrolytic capacitor.
Measure 290-VDC line voltage.
300 V or higher.
Replace electrolytic capacitor.
Layer short-circuit in expansion
valve coil.
Measure resistance.
46±3Ω in each phase (at 20
℃
)
Replace coil.
CAUTION:
If fuse FU1/FU5 (outdoor unit control circuit board) is blown, be careful of charging voltage in inverter electrolytic capacitor C9, C10.
To discharge stored electricity, unplug the power cord and connect the plug of a soldering iron (230VAC, 50W) between the positive and
negative terminals of inverter electrolytic capacitor C9, C10.
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