Mitsubishi Electric CITY MULTI PUHY-P200YEM-A Service Handbook page 125

Checking code Meaning, detecting method
1302 High pressure When press. sensor detects
abnoramlity 2 0.098MPa or less just before
(Outdoor unit) starting of operation, erro stop
is observed with code No. "1302"
displayed.
1368 Liquid When liquid side press, sensor, gas
side side pressure sensor, or interme-
diate pressure sensor detects
2.94MPa or more, error stop is
observed with code No. "1368", or
"1370" displayed.
1370 Intermedi-
ate side
Cause
1) Fall in internal press. caused by
gas leak.
2) Press. sensor trouble.
3) Film breakage.
4) Coming off of pin in connector por-
tion, poor contact.
5) Broken wire.
6) Press. sensor input circuit trouble
on control circuit board.
1) Poor operations of indoor LEV.
2) Poor operations of BC controller
LEV:
Heating-only, heating-principal:
LEV3
Defrost: LEV3
3) Poor operations of BC controller
SVA:
Cooling-only, cooling-principal
4) Poor operations of BC controller
SVB:
Heating-only, heating-principal
5) Solenoid valve SV (3 ~ 6) trouble
Cooling-only, cooling-principal
6) Setting error of connection address.
7) Poor operations of ball valve.
8) Short cycle of indoor unit.
9) Clogging of indoor unit filter.
10)Fall in air volume caused by dust
on indoor unit fan.
11)Dust on indoor unit heat exchanger.
12)Indoor unit fan block, motor trouble.
8)~12) : Rise in high pressure
caused by lowered condensing
capacity in heating-only and
heating-principal operation.
13)Short cycle of outdoor unit.
14)Dust on outdoor unit heat ex-
changer.
15) Outdoor unit fan block, motor trou-
ble, poor operations of fan control-
ler.
13)~15) : Rise in high press.
caused by lowered condensing
capacity in cooling-only and
cooling-principal operation.
16)Poor operations of solenoid valves
SV1.
(Bypass valves (SV1) can not
control rise in high pressure.)
17)Thermistor trouble (TH2, TH5, TH6).
18)Pressure sensor trouble.
19)Control circuit board thermistor
trouble, press. sensor input circuit
trouble.
20)Poor mounting of thermistor.
(TH2, TH5, TH6)
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Checking method & Countermeasure
See Trouble check of pressure sen-
sor.
Check operations status by actually
performing cooling or heating opera-
tions.
Cooling : Indoor LEV
LEV1, 3
SVA SV3~6
Heating : Indoor LEV
LEV3
SVB
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 measures
to trouble.
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.
Check Trouble check of pressure
sensor.
Check inlet temperature and press. of
sensor with LED monitor.