Mitsubishi Electric CITY MULTI PQRY-P200YMF-C Service Handbook page 109

Checking code Meaning, detecting method
1302 High pressure When press. sensor detects 1kg/
abnoramlity 2 cm 2 G (0.098MPa) or less just be-
(Heat source fore starting of operation, erro stop
unit) is observed with code No. "1302"
displayed.
1500 Overchanged 1. When liquid level of accumula-
refrigerant tor reaches AL=2 (overflow level)
abnormality and Td-Tc
erations (the first time), heat
source unit stops once, mode is
changed to restart mode after 3
minutes, then the unit restarts.
2. When liquid level of accumulator
reaches AL=2 (overflow level) and
Td-Tc
ond time), error stop is observed
with code No."1500" displayed.
3. When liquid level of accumula-
tor reaches AL=2 (overflow level)
and Td-Tc
minutes after stop of heat source
unit, the detection is regarded as
the first time and the process
shown in 1. is observed.
1501 Lacked 1. When the unit condition is as
refrigerant follows, the compressor is
abnormal- stopped (1st detection) and af-
ity ter 3 minutes, the compressor
is restarted automatically.
1 F<60Hz and TH10>85°C
2 F<60Hz and TH10>95°C
3 F
4 F
2. If the temperature rises again
as above within 2 hours after
the heat source unit is stopped
(2nd detection), an error stop is
performed, and the check code
1501 is displayed.
3. If the temperature rises again
as above within 2 hours after
the heat source unit is stopped,
it becomes the first detection
again, and operation is the
same as in 1 above.
4. The 2 hour period after the heat
source unit stops is the abnor-
mal delay period, and LED dis-
play is carried out during the ab-
normal stop delay.
20 deg during op-
20 deg again (the sec-
20 deg 30 or more
continuously for 60 minutes.
continuously for 15 minutes.
60Hz and TH10>100°C
continuously for 60 minutes.
60Hz and TH10>110°C
continuously for 15 minutes.
Cause
1) Fall in internal press. caused by
gas leak.
2) Press. sensor trouble.
3) Film breakage.
4) Coming off of pin in connector por-
tion, poor contact.
5) Broken wire.
6) Press. sensor input circuit trouble
on control circuit board.
1) Excessive refrigerant charge.
2) Broken wire of liquid level heater.
3) Poor heater output caused by con-
trol circuit board trouble.
4) Thermistor trouble. (TH2)
5) Thermistor input circuit trouble on
control circuit board
6) Poor mounting of thermistor.
(TH2, TH3, TH4)
4. 30 minutes after stop of heat
source unit is intermittent fault
check period with LED displayed.
1) Gas leakage, insufficient gas.
2) Overload operation.
3) Indoor unit LEV operation is faulty.
4) Heat source unit SLEV operation
is faulty.
5) Ball valve operation is faulty.
6) The thermistor is faulty.
7) The control board's thermistor in-
put circuit is faulty.
–108–
Checking method & Countermeasure
See Trouble check of pressure sen-
sor.
See Refrigerant amount check.
Check resistance of thermistor.
Check temperature and pressure of
. sensor with LED monitor.
5. In the case of ignore error indi-
cation switch (SW2-6) ON, the de-
tection for the second time is fol-
lowed by the first time.
Refer to the item on judging the refrig-
erant volume.
Check the indoor and heat source unit
operating conditions.
Actually run the equipment in cooling
or heating mode and check the operat-
ing condition.
Cooling :
Heating :
Refer to the item concerning judging
LEV failure.
Check with the ball valve fully open.
Check the thermistor's resistance.
Check the sensor's temperature read-
ing by the LED monitor.
Indoor unit LEV
SLEV, LEV2
Indoor unit LEV
SLEV, LEV2