Mitsubishi Electric PURY-P200 Service Handbook page 129

Checking code Meaning, detecting method
1102 Discharge
temperature
abnormality
(Outdoor unit)
1301 Low pressure When starting the compressor
abnoramlity from Stop Mode for the first time
(include the time when starting
the compressor for the next time,
when starting bound power,
ending bound power or when
the thermo turns off just after
the remote controller is turned
on), check the low-pressure
sensor beforehand. If the sensor
is 0.098MPa, stop the operation
immediately after starting.
1302 High pressure 1. When pressure sensor
abnoramlity 1 detects 3.87MPa or more
(Outdoor unit) during operations (the first
time), outdoor unit stops once,
mode is changed to restart
mode after 3 minutes, then
the outdoor unit restarts.
2. When a pressure of 3.87MPa
or more is detected again (the
second time) within 30
minutes after first stop of
outdoor unit, mode is
changed to restart mode after
3 minutes, then the outdoor
unit restarts.
3. When 3.87MPa or more
pressure is detected again
(the third time) within 30
minutes after stop of outdoor
unit, error stop is observed
with code No. "1302"
displayed.
4. When 3.87MPa or more
pressure is detected 30 or
more minutes after stop of
outdoor unit, the detection is
regarded as the first time and
the process shown in 1. is
observed.
5. 30 minutes after stop of
outdoor unit is intermittent
fault check period with LED
displayed.
6. Error stop is observed
immediately when pressure
switch (4.15
in addition to pressure sensor.
(12) Gas leak between low and
high pressures.
4-way valve trouble, compressor
trouble, solenoid valve SV1 trouble.
(13) Thermistor trouble
(TH11, TH12).
(14) Thermistor input circuit
trouble on control circuit
board.
(1) Internal pressure is dropping
due to a gas leak.
(2) The low pressure pressure
sensor is defective.
(3) Insulation is torn.
(4) A pin is missing in the
connector, or there is faulty
contact.
(5) A wire is disconnected.
(6) The control board's low
pressure pressure sensor
input circuit is defective.
(1) Poor operations of indoor
LEV → Heating
(2) Poor operations of the BC
controller
Heating-only or heating-main
→ Indoor LEV3
Defrost → LEV3
(3) Poor operations of the BC
controller SVM1, SVM2
→ Cooling-only/Defrost
(4) Poor operations of the BC
controller SVA → Cooling-
only/Cooling-main
(5) Poor operations of the BC
controller SVB → Heating-
only/Heating-main
(6) Poor operations of the
solenoid valve SV (4a~4d
(P200~P400type), 4a~4d,
5a, 5b (P450~P650type))
→ Heating-only/Heating-main
(7) Branch port address setting
error
(8) Poor operations of ball valve.
(9) Short cycle of indoor unit.
(10) Clogging of indoor unit filter.
(11) Fall in air volume caused by
dust on indoor unit fan.
(12) Dust on indoor unit heat
exchanger.
(13) Indoor unit fan block, motor
trouble.
(2)~(13) : Rise in high pressure
caused by lowered condensing
capacity in heating-only and
heating-main operation.
+0
MPa) operates
-1.5
(14) Short cycle of outdoor unit.
(15) Dust on outdoor unit heat
exchanger.
- 126 -
Cause Checking method & Countermeasure
Check operation status of
cooling-only or heating-only.
Check resistance of thermistor.
Check inlet temperature of
sensor with LED monitor.
Refer to the item on judging low
pressure pressure sensor failure.
Check operations status by
actually performing cooling or
heating operations.
Heating : Indoor LEV
See Trouble check of LEV and
solenoid valve.
Confirm that ball valve is fully
opened.
Check indoor unit and take
measures to trouble.
Check outdoor unit and take
measures to trouble.