Mitsubishi City Multi PURY-P400 Service Handbook page 108

Checking code Meaning, detecting method
1111 Low 1. When saturation temperature
pressure sensor (TH2) or liquid level de-
saturation tecting temperature sensors
tempera- (TH3, TH4) detects -40˚C or
ture less (the first time) during op-
sensor erations, outdoor unit stops
abnormal- once, mode is changed to re-
ity (TH2) start mode after 3 minutes, then
the outdoor unit restarts.
2. When -40˚C or lower temp. is
detected again (the second
time) within 30 minutes after
stop of outdoor unit, error stop
is observed with code Nos.
"1111," "1112," or "1113" dis-
played.
3. When -40˚C or lower tempera-
ture is detected 30 or more min-
1112 Liquid- utes after stop of outdoor unit,
level the stop is regarded as the first
detecting time and the process shown in
tempera- 1. is observed.
ture
sensor 4. Thirty minutes have past since
abnormal- the outdoor unit first stopped
ity (TH4) and no stop for this reason has
occurred for 30 minutes, the
preliminary fault code "1202"
will be displayed.
Note:
1. Low press. saturation tem-
perature trouble is not de-
tected for 3 minutes after
compressor start, and finish
of defrosting operations, and
during defrosting operations.
2. In the case of short/open of
1113 Liquid- TH2~TH4 sensors before
level starting of compressor or
detecting within 10 minutes after start-
tempera- ing of compressor, "1111,"
ture "1112," or "1113" is displayed
sensor too.
abnormal-
ity (TH3)
Cause
1) Gas leak, Gas shortage.
2) Insufficient load 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
Defrost : LEV3
5) Poor operations of BC controller
SVM1:
Cooling-only, Defrost
6) Poor operations of BC controller
SVM1:
Cooling-only, Cooling-main
7) Poor operations of BC controller
SVB:
Heating-only, Heating-main
8) Solenoid valve trouble (SV3 ~ 8)
Heating-only, Heating-main
9) Setting error of connection address.
10)Poor operations of ball valve.
11)Short cycle of indoor unit.
12)Clogging of indoor unit filter.
13)Fall in air volume caused by dust
on indoor unit fan.
14)Dust on indoor unit heat exchanger.
15)Indoor unit block, Motor trouble.
9)~14) : Fall in low pressure
caused by evaporating capac-
ity in cooling-only cooling-prin-
cipal operation.
16)Short cycle of outdoor unit.
17)Dust on outdoor heat exchanger.
18)Indoor unit fan block, motor trouble,
and poor operations of fan control-
ler.
15)~17) : Fall in low press.
caused by lowered evaporating
capacity in heating-only heat-
ing-principal operation.
19)Poor operations of solenoid valve
SV4a.
Bypass valve (SV4a) cannot
control low pressure drop.
20)Thermistor trouble (TH2~TH10).
21)Pressure sensor abnormality.
22)Control circuit board thermistor
abnormality and pressure sensor
input circuit abnormality.
23)Poor mounting of thermistor
(TH2~TH10).
–107–
Checking method & Countermeasure
See Refrigerant amount check.
Check operating conditions and opera-
tion status of outdoor unit.
Check operation status by actually per-
forming cooling-only or heating-only
operations.
Cooling-only : indoor LEV
LEV1, 3 (BC)
SVM (BC)
SVA (BC)
Heating-only : indoor LEV
LEV3
(BC)
SVB (BC)
SV3~8
See Trouble check of LEV and sole-
noid valve.
Check address setting of indoor unit
connector.
Confirm that ball valve is fully opened.
Check indoor unit, and take measu-res
to troube.
Check outdoor unit, and take measures
to trouble.
Check outdoor unit fan.
See Trouble check of outdoor unit
fan.
See Trouble check of solenoid valve.
Check resistance of thermistor.
See Trouble check of pressure sen-
sor.
Check inlet temp. and press. of sensor
by LED monitor.