AYZP40KR
3 – 7
7. Compressor does not start
8. 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 (230VAC, 50W) between the positive and
negative terminals of inverter electrolytic capacitor C9, C10.
[6] MALFUNCTION (PARTS) CHECK METHOD
1. Procedure for determining defective outdoor unit IPM/compressor
The following flow chart shows a procedure for locating the cause of a malfunction when the compressor does not start up and a DC overcurrent indi-
cation error occurs.
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.
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.
Replace IPM.
Dried-up electrolytic capacitor.
Check electrolytic capacitor.
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 198 V or higher.
Compressor lock.
Supply current and touch com-
pressor cover (sound absorbing
material) to check if operation
starts.
Compressor should start nor-
mally.
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
3
in each phase (at 20
C)
Replace coil.
Main cause
Inspection method
Normal value/condition
Remedy
