Mitsubishi Electric PUHY-P168, Service Handbook, Page: 280 / 404

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[
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[248°F] or more is
detected during the
above operation (the
first detection), the
outdoor unit stops
once, turns to anti-re-
start mode for 3 min-
utes, and restarts after
3 minutes automati-
cally.
2.If the discharge tem-
perature 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 min-
utes.
3.If the discharge tem-
perature of 120 °C
[248°F] or more is de-
tected (the third detec-
tion) 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 tem-
perature of 120 °C
[248°F] or more is de-
tected more than 30
minutes after the pre-
vious stop of the out-
door 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) BC controller LEV mal-
function
Cooling only : LEV3
Cooling main : LEV1,2,3
Heating only or heating
main : LEV3
Defrost : FLEV3
(5) BC controller SVM1 and 2
malfunction
-> Cooling only or defrost
(6) BC controller SVA mal-
function
-> Cooling only or cooling
main
(7) BC controller SVB mal-
function
-> Heating only or heating
main
(8) Solenoid valve SV mal-
function (4a-4d (P72-P144
models) ,4a-4d and 5a, 5b
(P168-P234models)):
heating only, heating main
Perform a heating operation and
check the operation.
Cooling: LEV on the indoor unit
LEV1,2,3
SVM1,2
SVA
Heating: LEV on the indoor unit
LEV3
SVB
SV4a - 4d
SV5a,5b
Refer to the page on trouble-
shooting LEV.
(9) Port address setting error. Confirm the port address of the in-
door unit.
(10) Closed ball valve Confirm that the ball valve is fully
open.
(11) Outdoor fan (including
fan parts) failure, motor
failure, or fan controller
malfunction
-> Heating only or heating
main
Rise in discharge temp. by
low pressure drawing for
(3) - (11).
Check the fan on the outdoor unit.
Refer to the section on troubleshoot-
ing the outdoor unit fan.
(12) Gas leak between low
and high pressures(4-way
valve failure, compressor
failure, solenoid valve
SV1, SV2 failure)
Perform a cooling or heating opera-
tion and check the operation.
(13) Thermistor failure
(TH11,TH12)
Check the thermistor resistor.
(14) Input circuit failure on the
controller board thermistor
Check the inlet air temperature on
the LED monitor and check for con-
tact failure of the connector.