Mitsubishi Electric PURY-100TMU, Service Handbook

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Checking code Meaning, detecting method Cause Checking method
1500
1501
Insufficient refrigerant abnor
mality
1. When discharge superheart
10 (18) deg is keeping for 10
minutes or discharge superheat
20 (36) deg for 15 minutes,
outdoor unit stops once, and af-
ter 3 minutes, the unit restarts.
For 60 minutes after unit stopped
is intermittent fault check period.
2. When discharge superheart 10
(18) deg is keeping for 10 min-
utes or discharge superheat 20
(36) deg for 15 minutes again
(second time), the unit stops and
error code 1500 is displayed.
3. In case of SW2-6 ON, the de-
tection for the second time is fol-
lowed by the first time.
1. When the unit condition is as
follows, the compressor is
stopped (1st detection) and af-
ter 3 minutes, the compressor
is restarted automatically.
1
F<60Hz and TH10>85
°
C
(185˚F) continuously for 60
minutes.
2
F<60Hz and TH10>95
°
C
(203˚F) continuously for 15
minutes.
3
F 60Hz and TH10>100
°
C
(212˚F) continuously for 60
minutes.
4
F 60Hz and TH10>110
°
C
(230˚F) continuously for 15
minutes.
2. If the temperature rises again as
above within 2 hours after the out-
door 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 out-
door 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 outdoor
unit stops is the abnormal delay pe-
riod, and LED display is carried out
during the abnormal stop delay.
Overcharged
refrigerant
abnormality
Lacked
refrigerant
abnormal-
ity
1) Excessive refrigerant charge.
2) Thermistor trouble (TH1).
3) Pressure sensor trouble (63HS).
4) Control circuit board trouble.
1) Gas leakage, insufficient gas.
2) Overload operation.
3) Indoor unit LEV operation is faulty.
4) Outdoor unit LEV1 operation is
faulty.
5) Outdoor unit SLEV operation is
faulty.
6) Ball valve operation is faulty.
7) The thermistor is faulty.
8) The control board’s thermistor in-
put circuit is faulty.
Check refrigerant amount.
Check resistance of thermistor.
See trouble shooting of pressure sensor.
Check temperature and pressure sen-
sor with LED monitor.
Refer to the item on judging the refrig-
erant volume.
Check the indoor and outdoor unit op-
erating conditions.
Actually run the equipment in cooling
or heating mode and check the operat-
ing condition.
Cooling : Indoor unit LEV
SLEV
Heating : Indoor unit LEV
SLEV
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.
Note :
°
C Scale (
°
F Scale)