MITSUBISHI ELECTRIC P500YMF-C - Manual (Page 107)

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Checking code Meaning, detecting method Cause Checking method & Countermeasure
Discharge
temperature
abnormality
(Outdoor unit) 1102 1. When 140˚C or more discharge
temperature is detected during
operations (the first time), out-
door unit stops once, mode is
changed to restart mode after
3 minutes, then the outdoor unit
restarts.
2. When 140˚C or more temp. is
detected again (the second
time) within 30 minutes after
stop of outdoor unit, emergency
stop is observed with code No.
“1102” displayed.
3. When 140˚C or more temp. is
detected 30 or more minutes
after stop of outdoor unit, the
stop is regarded as the first time
and the process shown in 1 is
observed.
4. 30 minutes after stop of outdoor
unit is intermittent fault check
period with LED displayed
(1202).
See Refrigerant amount check.
Check operating conditions and opera-
tion status of indoor/outdoor units.
Check operation status by actually
performing cooling or heating opera-
tions.
Cooling : Indoor LEV
(Cooling-only) LEV1, 3 (BC)
SVM1 (BC)
SVA (BC)
Heating : Indoor LEV
(Heating-only) LEV3 (BC)
SVB (BC)
SV3 ~ 8
See Trouble check of LEV and sole-
noid valve.
1) Gas leak, gas shortage.
2) Overload operations.
3) Poor operations of indoor LEV.
4) Poor operations of BC controller
LEV:
Cooling-only
: LEV3
Cooling-main : LEV1, 3
Heating-only, Heating-main:
LEV3
Defronst : LEV3
5) Poor operations of BC controller
SVM1
:
Cooling-only, defrost
6) Poor operations of BC controller
SVA
:
Cooling-only, Cooling-main
7) Poor operations of BC controller
SVB :
Heating-only, Heating-main
8) Poor operations of solenoid
valves.
SV (3 ~ 8)
Heating-only, Heating-main
9) Setting error of connection
address (PURY).
10)Poor operations of ball valve.
11) Outdoor unit fan block, motor
trouble, poor operations of fan
controller
→
Heating (Heating-only,
Heating-main).
3) ~ 11) : Rise in discharge
temp. by low pressure drawing.
12)Gas leak between low and high
pressures.
4-way valve trouble, compres-
sor trouble, solenoid valve
SV1 trouble.
13)Poor operations of solenoid valve
SV4a.
Bypass valve SV2 can not
control rise in discharge temp.
14)Thermistor trouble.
15)Thermistor input circuit trouble on
control circuit board.
Check address setting of indoor unit
connection.
Confirm that ball valve is fully opened.
Check outdoor fan.
See Trouble check of outdoor fan.
Check operation status of cooling-only
or heating-only.
See Trouble check of solenoid
valve.
Check resistance of thermistor.
Check inlet temperature of sensor
with LED monitor.