Mitsubishi Electric PURY-P72 Service Handbook page 194

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[IX Troubleshooting]
1. Error Code
II
1102
II
Discharge temperature fault
2. Error definition and error detection method
1) If the discharge temperature of 120"C [248"F] or more is detected during the above operation (the first detection), the outdoor
unit stops once, tums to anti-restart mode for 3 minutes, and restarts after 3 minutes automatically.
2) If the discharge temperature of 120" C [248"F] or more is detected again (the second detection) within 30 minutes after the
second stop of the outdoor unit described above, the mode will be changed to 3 - minute restart mode, then the outdoor unit
will restart in 3 minutes.
3) If the discharge temperature of 120"C [248"F] 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 displayed.
4) If the discharge temperature of 120"C [248"F] 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 described in step 1 above will start.
5) For 30 minutes after the stop (the first stop or the second stop) of the outdoor unit, preliminary errors will be displayed on the
LED display.
3. Cause, check method and remedy
Cause
Check method and remedy
(1 ) Gas leak, gas shortage Refer to the page on refrigerant amount
evaluation.(page 157)
(2) Overload operation Check operating conditions and operation status of indoor/
outdoor units.
(3)
LEV failure on the indoor unit Perform a heating operation and check the operation.
(4) BC controller LEV malfunction
Cooling: LEV on the indoor unit
LEV1,2,3
Cooling only: LEV3
SVM1,2
Cooling main: LEV1,2,3
SVA,C
Heating only or heating
Heating: LEV on the indoor unit
main: LEV3
LEV3
Defrost : LEV3
SVB
(5) BC controller SVM1 and 2 malfunction
SV4a -4d
-> Cooling only or defrost
Refer to the page on troubleshooting LEV.(page 279)
(6) BC controller SVA malfunction
-> Cooling only or cooling main
(7)
BC controller SVB malfunction
-> Heating only or heating main
(8)
Solenoid valve SV malfunction (4a-4c (P72
model) ,4a-4d (P96 and P120 models))
:heating only, heating main
(9) Port address setting error.
Confirm the port address of the indoor unit.
(10) Closed ball valve Confirm that the ball valve is fully open.
(11 ) Outdoor fan (including fan parts) failure, mo- Check the fan on the outdoor unit.
tor failure, or fan controller malfunction Refer to the section on troubleshooting the outdoor unit
Rise in discharge temp. by low pressure fan.(page 279)
drawing for (3) - (11).
(12) Gas leak between low and high pressures Perform a cooling or heating operation and check the opera-
(4-way valve failure, Compressor failure, So- tion.
lenoid valve (SV1a) failure)
(13) Thermistor failure Check the thermistor resistor.(page 217)
(TH4)
(14) Input circuit failure on the controller board Check the inlet air temperature on the LED monitor.
thermistor
HWE0803A
- 184-
GB