IVT 12KHR-N Service Manual page 29

Main cause
Dew condensation on light receiv-
ing unit.
5. Louvers do not move
Main cause
Caught in sliding section.
Disconnected connector (CN13,
CN16, CN19) on relay PWB, lou-
ver motor side)
Contact of solder on PWB
(connector section on PWB)
6. There is noise in TV/radio
Main cause
Grounding wires not connected
properly.
TV/radio is placed too close to
outdoor unit.
Other than above.
7. Malfunction occurs
Main cause
Malfunction caused by noise.
8. Compressor does not start
Main cause
Erroneous inter-unit connection.
Damaged IPM.
Dried-up electrolytic capacitor.
Blown outdoor unit fuse.
Power supply voltage is too low.
Compressor lock.
Temp. fuse of terminal is error
EEEPROM error
AC Over current error
9. Operation stops after a few minutes and restarts, and this process repeats
Main cause
Dried-up electrolytic capacitor.
Layer short-circuit in expansion
valve coil.
CAUTION: If fuse FU1/FU4/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.
Inspection method
Check for water and rust.
Inspection method
Operate to see if louvers are
caught in place.
Inspect connectors.
Check visually.
Inspection method
Check grounding wire connec-
tions.
Check distance between TV/radio
and outdoor unit.
Check for radio wave interfer-
ence.
Inspection method
Check for radio wave interfer-
ence.
Inspection method
Check wiring between indoor and
outdoor units.
Check IPM continuity.
Check electrolytic capacitor.
Check 20A fuse.
Check 15A fuse.
Measure power supply voltage
during startup.
Supply current and touch com-
pressor cover (sound absorbing
material) to check if operation
starts.
See (Diagnosis Function and dis-
play mode) on page 3-13
Inspection method
Measure 320VDC line voltage.
Measure resistance.
Normal value/condition
Signal should be received within
range specified in manual.
Normal value/condition
Louvers should operate smoothly. Remove or correct catching sec-
Connectors or pins should not be
disconnected.
There should not be solder con-
tact.
Normal value/condition
Grounding wires should be con-
nected properly.
If TV/radio is placed too close, it
may become affected by noise.
Normal value/condition
Normal value/condition
Terminal board 1-N: 220-240
VAC, 50 Hz
Terminal board 2: serial signal
See [IPM check method] on page
3-10
See [Inverter electrolytic capaci-
tor (C9,C10) check method] on
page 3-9
Fuse should not be blown.
230 10 VAC, 50 Hz
Compressor should start nor-
mally.
Malfunction display section (0-0)
Compressor should start nor-
mally.
Normal value/condition
300 V or higher.
46 3 in each phase (at 20 C)
3 – 7
12KHR-N
Remedy
Take moisture-proof measure for
lead wire outlet of light receiving
section.
Remedy
tion.
Install correctly.
Correct contacting section.
Remedy
Connect grounding wires prop-
erly.
Move TV/radio away from outdoor
unit.
Remedy
Remedy
Correct wiring.
Replace IPM.
Replace electrolytic capacitor.
Replace fuse/diode bridge.
Replace fuse.
Replace outdoor unit PWB
assembly.
Make sure that power supply volt-
age is 200 V or higher.
Apply external impact to com-
pressor.
Replace compressor.
Replace terminal
Replace outdoor unit PWB
Replace outdoor unit PWB
Remedy
Replace electrolytic capacitor.
Replace coil.