Mitsubishi Electric PUHY-200YMF-B Service Handbook page 136

Checking code Meaning, detecting method
1500 Overchanged 1. When liquid level of accumula-
refrigerant tor reaches AL=2 (overflow level)
abnormality and Td-Tc
erations (the first time), outdoor
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 outdoor
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.
PU(H)Y-200·250YMF-B
I Cooling mode
1 F<60Hz, TH1>120°C
I Heating mode
1 F<60Hz, TH1>100°C,
2 F<60Hz, TH1>120˚C,
PUHY-P200·250YMF-B
1 F<60Hz and TH10>85°C
2 F<60Hz and TH10>95°C
3 F
4 F
PURY-200·250YMF-B
I Cooling mode
1 F<60Hz and Td>120°C and
I Heating mode
1 F<60Hz and Td>100°C and
2 F<60Hz and Td>120°C and
PURY-P200·250YMF-B
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 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.
20 deg during op-
20 deg again (the sec-
20 deg 30 or more
TH1-Tc>60deg
TH1-Tc>55deg.
TH5>15˚C
TH1-Tc>70deg.
TH5 15˚C
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.
Td-Tc>60 deg
Td-Tc>55 deg and TH7>15°C
Td-Tc>70deg and TH7 15°C
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) 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, TH3, TH4).
5) Thermistor input circuit trouble on
control circuit board.
6) Poor mounting of thermistor.
(TH2, TH3, TH4)
4. 30 minutes after stop of outdoor
unit is intermittent fault check pe-
riod with LED displayed.
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.
–134–
Checking method & Countermeasure
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 outdoor unit op-
erating conditions.
Actually run the equipment in cooling
or heating mode and check the operat-
ing condition.
Cooling : Indoor unit LEV
LEV1 (PUHY)
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.