Mitsubishi Electric PUHY-HP144TSHMU-A Service Handbook page 130

[ IX Troubleshooting ]
1. Error Code
1102
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, turns 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
(1) Gas leak, gas shortage
(2) Overload operation
(3) LEV failure on the indoor unit
(4) Outdoor unit LEV2a, 2b, 4 actuation failure
(5) Closed refrigerant service valve
(6) Outdoor fan (including fan parts) failure, mo-
tor failure, or fan controller malfunction
Rise in discharge temp. by low pressure
drawing for (3) - (6).
(7) Gas leak between low and high pressures
(4-way valve failure, Compressor failure, So-
lenoid valve (SV1a) failure)
(8) Thermistor failure
(TH4)
(9) Input circuit failure on the controller board
thermistor
HWE0716A
Check method and remedy
Refer to the page on refrigerant amount evaluation.
Check operating conditions and operation status of indoor/
outdoor units.
Perform a cooling or heating operation to check the opera-
tion.
Cooling: Indoor unit LEV
LEV1, 2a, 2b, 4
Heating: Indoor unit LEV
LEV1, 2a, 2b, 4
Refer to the section on troubleshooting the LEV.(page 192)
Confirm that the refrigerant service valve is fully open.
Check the fan on the outdoor unit.
Refer to the section on troubleshooting the outdoor unit
fan.(page 191)
Perform a cooling or heating operation and check the opera-
tion.
Check the thermistor resistor.(page 144)
Check the inlet air temperature on the LED monitor.
- 121 - GB