Checking code Meaning, detecting method Cause Checking method & Countermeasure
Check inlet temperature and press.
of sensor with LED monitor.
See Trouble check of pressure
sensor.
Once vacuum operation protection
is commenced, do not attempt to re-
start until taking the measures be-
low.
<Checking method>
•Check ball valve for neglecting to
open.
•Check extended piping for clog-
ging when ball valve is opened.
•Check transmission line for erro-
neous wiring. (Confirm the cor-
rect wiring and piping connection
between indoor and outdoor
units by operating indoor unit one
by one.)
<Countermeasure>
•After checking with the above
method, make error reset by
power source reset.
•Then operate for 10~15-minutes
under the operation mode re-
verse to that when the vacuum
operation protection occurred
(Heating if error occurred in cool-
ing, while cooling if it occurred in
heating), and then enter into the
ordinary operation state.
When press. sensor detects
1kg/cm2 or less just before
starting of operation, erro stop
is observed with code No.
"1302" displayed.
<Condition 1>
1. Judging that the state when
the suction pressure reaches
0kg/cm2G during compres-
sor operation indicates high
pressure by the discharge
temperature and low pres-
sure saturation temperature,
the back-up control by gas
bypassing will be conducted.
2. The outdoor unit once stops
entering into the 3-minutes
restart mode if the state of 1
continues for 3 minutes, and
restarts after 3 minutes.
3. After restarting, if the same
state as 1 continues within
30 minutes from the stopping
of 2, error stop will be com-
menced displaying “1505”.
4. Ineffective if the compressor
operating time (integrated)
exceeds 60-minutes not de-
tecting trouble.
High pressure
trouble 1
(Outdoor unit)
High pressure
trouble 2
(Outdoor unit)
Suction
pressure
trouble
16
)Control circuit board thermistor
trouble, press. sensor input cir-
cuit trouble
17
)Poor mounting of thermistor
(TH2, TH5, H6)
18)Coming loose the connecter of
pressure switch or cut of the wire.
1) Fall in internal press. caused by
gas leak
2) Press. sensor trouble
3) Film breakage
4) Coming off of pin in connector
portion, poor contact
5) Broken wire
6) Press. sensor input circuit trouble
on control circuit board
•Operation while neglecting to
open ball valve. Especially for the
ball valve at low pressure side.
At cooling : Gas side ball valve
At heating : Liquid side ball
valve
•When plural systems are existing,
the low pressure abruptly drop at
indoor stopping by the erroneous
wiring of transmission line (differ-
ent connection of transmission
line and refrigerant piping).
•Temporary vacuum condition due
to refrigerant distribution unbal-
ance (insufficient refrigerant of
low pressure line) immediately af-
ter charging refrigerant.
1302
1505
1500 1.
2.
3.
4.
5.
Overcharged
refrigerant
abnormality
1) Excessive refrigerant charge.
2) Main circuit board thermistor
input circuit trouble
Thermistor mounting trouble
(TH1, TH2)
3)
Refer to the section on judging the
refrigerant volume.
Check the sensor detection
temperature and pressure with
the LED monitor.
If the discharge SH<
=10K is
detected during operation (at
first detection), the outdoor
unit stops at once. The 3-
minute restart prevention
mode is entered. After three
minutes, the outdoor unit
starts up again.
If the discharge SH<
=10K is
detected again within 30
minutes after the outdoor unit
stops (second detection), an
abnormal stop is applied, and
"1500" is displayed.
If discharge SH<
=10K is
detected more than 30
minutes after the outdoor unit
stops, the state is the same
as the first detection and the
same operation as 1 above
takes place.
The abnormal stop delay
period is in effect for 30
minutes after the outdoor unit
stops. The abnormal stop
delay period LED turns ON
during this time.
If the abnormality detection
prohibit switch (SW2-4) is
ON, the same operation as
the first detection will apply
for the second and following
detections.
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