AEX12GRN
3 – 7
6. There is noise in TV/radio
7. Malfunction occurs
8. Compressor does not start
9. Operation stops after a few minutes and restarts, and this process repeats
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 (100VAC, 50W) between the positive and
negative terminals of inverter electrolytic capacitor C9, C10.
Main cause Inspection method Normal value/condition Remedy
Grounding wires not connected
properly.
Check grounding wire connec-
tions.
Grounding wires should be connected
properly.
Connect grounding wires prop-
erly.
TV/radio is placed too close to
outdoor 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 interfer-
ence. (See page )
Main cause Inspection method Normal value/condition Remedy
Malfunction caused by noise. Check for radio wave interfer-
ence. (See page )
Main cause Inspection method Normal value/condition Remedy
Erroneous inter-unit connection. Check wiring between indoor and
outdoor units.
Terminal board 1-N: 230 VAC, 50 Hz
Terminal board 2: serial signal
Correct wiring.
Damaged IPM. Check IPM continuity. Refer to IPM check method – 3 Replace IPM.
Dried-up electrolytic capacitor. Check electrolytic capacitor. Refer to Inverter electrolytic capacitor
(C9, C10) check method – 2
Replace electrolytic capacitor.
Blown outdoor unit fuse. Check 20-A fuse.
Check 15-A 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
during startup.
230±10 VAC, 50 Hz Make sure that power supply volt-
age is 180 V or higher.
Compressor lock. Supply current and touch com-
pressor cover (sound absorbing
material) to check if operation
starts.
Compressor should start normally. Apply external impact to com-
pressor.
Replace compressor.
Main cause Inspection method Normal value/condition Remedy
Dried-up electrolytic capacitor. Measure 320-VDC line voltage. 250 V or higher. Replace electrolytic capacitor.
Layer short-circuit in expansion
valve coil.
Measure resistance. 46±3Ω in each phase (at 20°C) Replace coil.
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