●
“RUN” light is flashing and “ALARM” are indicated on the remote control switch.
The unit No., alarm code and the unit code are alternately indicated on the set temperature section, and
the unit No. and alarm code are indicated on the display of the outdoor unit PCB1.
This alarm is indicated when the following conditions occurs three times within one hour;
(1) The temperature of the thermistor on the top of the compressor is maintained higher than 132°C for
10 minutes, or (2) The temperature of the thermistor on the top of the compressor is maintained higher
than 140°C for 5 seconds.
Alarm
Code
Increase in Discharge Gas Temperature at the Top of Compressor
Is the thermistor on
top of compressor
normal? *1)
Yes
Check the outdoor unit
PCB1 if the compressor
discharge gas
temperature is over
132
o
C.
Faulty Thermistor
No
No
Is the thermistor
installed correctly
on the compressor?
Yes
Install it correctly.
No
Is it at cooling or
heating mode when the
alarm has occurred?
Is the opening of all the
operating indoor units
expansion valve 100%?
Is the amount of
refrigerant correct?
Is gas leaking?
Yes
Yes
Yes
Yes
Yes
Yes
Cooling
Check the outdoor unit
PCB1 if the compressor
discharge gas
temperature is over
132
o
C.
Heating Operation
Cooling Operation
Heating
No
Plug the connectors
(*2) of PCB1
properly.
No
Charge correct
refrigerant volume.
Refer to TC.
No
Check the
expansion valve.
No
No
Remove sudden
fluctuation of indoor
load (short path, etc.)
or short path of air
between outdoor units.
Repair leaks of gas.
Recharge refrigerant.
No
Is the opening of
the outdoor unit
expansion valve
100%?
Are the connectors
(*2) of PCB1 of the
outdoor unit heat
exchanger's
expansion valve
connected properly?
Yes
Remove sudden
fluctuation of load
like short path by
discharge air from
the outdoor unit, or
the cause of frequent
thermo-ON/OFF.
*1): Refer to "Characteristics of Thermistor"
of "Alarm Code 23".
*2): PCB1 Connector No. is shown
in the below table.
MV1
MVB
CN10
CN12
Position of Thermistor
THM8 (Td1)
for Inverter Drive
AVWT-76* to AVWT-
96
*
THM9 (Td2)
for
Constant
Drive
AVWT-1
14
* to AVWT-
154
*
PCB1: Control PCB in Outdoor Unit
202
