TROUBLESHOOTING
1-26
“RUN” light flickers and “ALARM” is indicated on the remote control switch.
The unit No., alarm code and the unit code is alternately indicated on the set temperature section,
and the alarm code is indicated on the display of the outdoor unit PCB.
This alarm code is indicated when voltage between terminal “P” and “N” of ISPM is insufficient and its
occurrence is three times in 30 minutes. In the case that the occurrence is smaller than 2 times, retry
is performed.
Alarm
Code
Excessively Low or High Voltage for Inverter
*1): If capacitor has high voltage, perform the high voltage discharge work refer to item 1.3.3.
*2): Checking procedures of ISPM is indicated in item 1.3.3.
TB3
+
-
N
P
Direct Current
Measuring Position
Measuring Range: DC1000V
RS W
RB
VTU
NPD P
TB2
R216
R215
ZN20
LED201
ZN202
R201
R200
CN207 CN206
CN9
PC207
C
PC208
CN8
RB
N
P
P1
Does the voltage
fall during operation
by operation of
other apparatus?
Is connection
correctly between
ISPM and DCL,
CB or CMC?
Does LED201 on
ISPM ON?
Check capacitors
(CB).
Restart operation.
Check wiring and
cable capacity.
Connect correctly.
Replace capacitors.
Capacitors have high voltage.
Be careful especially. *1)
Yes
Yes
Yes
Check the wiring, ISPM
and capacitors (CB). *2)
Yes
Yes
Normal
Fault
(Loose Wiring,
Change of
Color)
Frequency can
increase higher
than 60Hz.
Compressor stops
immediately.
(lower than 20Hz)
Compressor stops
when frequency
increase. (Approx.
20Hz to 60Hz
How is
compressor
operation?
Is the DC voltage
over 250V?
* Be careful especially because of high voltage.
Yes
No
No
No
No
No
No
Is the voltage over
187V during operation?
Faulty ISPM.
Replace it.
Faulty ISPM.
Replace it.
Is the power supply
voltage 220V,
240V 10%?
+
_
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