Mitsubishi Electric PU(H)Y-P250YGM-A, Service Handbook

Page: 124 / 215

- 115 -
[
IX
Troubleshooting ]
Error Code
Error definition and error
detection method
Cause Check method and remedy
1102 Abnormal dis-
charge air tem-
perature 1.If the discharge tem-
perature of 120°C or
more is detected dur-
ing the above opera-
tion (the first
detection), the out-
door unit stops once,
turns to anti-restart
mode for 20 seconds,
and restarts after 20
seconds automatical-
ly.
2.If the discharge tem-
perature of 120°C or
more is detected
again (the second de-
tection) within 30 min-
utes after the second
stop of the outdoor
unit described above,
the mode will be
changed to 20-second
restart mode, then the
outdoor unit will restart
in 20 seconds.
3.If the discharge tem-
perature of 120°C or
more is detected (the
third detection) within
30 minutes after the
stop of the outdoor
unit described above
(regardless of the first
or the second stop),
the outdoor unit will
make an error stop,
and the error code
"1102" will be dis-
played.
4.If the discharge tem-
perature of 120°C or
more is detected more
than 30 minutes after
the previous stop of
the outdoor unit, the
detection is regarded
as the first detection,
and the operation de-
scribed in step 1
above will start.
5.For 30 minutes after
the stop (the first stop
or the second stop) of
the outdoor unit, pre-
liminary errors will be
displayed on the LED
display.
(1) Gas leak, gas shortage Refer to the page on refrigerant
amount evaluation.
(2) Overload operation Check operating conditions and op-
eration status of indoor/outdoor
units.
(3) LEV failure on the indoor
unit
(4) LEV1 failure on the out-
door unit
Perform a cooling or heating opera-
tion and check the operation.
Cooling : LEV on the indoor unit
LEV1
Heating : LEV on the indoor unit
Refer to the page on troubleshooting
LEV.
(5) Closed ball valve Confirm that the ball valve is fully
open.
(6) Outdoor fan (including fan
parts) failure, motor failure,
or fan controller malfunc-
tion
Rise in discharge temp. by
low pressure drawing for
(3) - (6).
Check the fan on the outdoor unit.
Refer to the section on troubleshoot-
ing the outdoor unit fan.
(7) Gas leak between low and
high pressures
(4-way valve failure, Com-
pressor failure, Solenoid
valve (SV1) failure)
Perform a cooling or heating opera-
tion and check the operation.
(8) Thermistor failure
(TH1,TH11,TH12)
Check the thermistor resistor.
(9) Input circuit failure on the
controller board thermistor
Check the inlet air temperature on
the LED monitor.