Mitsubishi Electric CITY MULTI PUHY-P108 Service Handbook page 283

[ IX Troubleshooting ]
Error Code
1302 Abnormal high
pressure 2
(outdoor unit)
1500 Refrigerant
overcharge
Error definition and error
detection method
If the pressure of (1) Inner pressure drop due to
0.098MPa[14psi] or low-
er is registered on the (2) Pressure sensor failure
pressure sensor immedi- (3) Shorted-circuited pressure
ately before start-up, it
will trigger an abnormal
stop, and error code (4) A pin on the male connec-
"1302" will be displayed.
(5) Disconnected pressure
(6) Failure of the pressure
An error can be detected (1) Overcharged refrigerant
by the discharge temper-
ature superheat.
(2) Thermistor input circuit
1. If the discharge SH
10K [18°F] or less is
(3) Faulty mounting of ther-
detected during oper-
ation (the first detec-
tion), the outdoor unit
stops at once, turns to
anti-restart mode for 3
minutes, and restarts
after 3 minutes auto-
matically.
2. If the discharge SH
10K [18°F] or less is
detected again within
30 minutes after first
stop of the outdoor
unit (the second de-
tection), the outdoor
unit will make an error
stop, and the error
code "1500" is dis-
played.
3. If discharge SH 10K
[18°F] or less is de-
tected more than 30
minutes after the out-
door unit stops, and
the operation de-
scribed in step 1
above will start.
4. For 30 minutes after
the stop of the outdoor
unit, preliminary errors
will be displayed on
the LED display.
Cause
a leakage.
sensor cable due to torn
outer rubber
tor on the pressure sensor
is missing or contact fail-
ure
sensor cable
sensor input circuit on the
controller board
failure on the main board
mistor
(TH11, TH12)
- 274 -
Check method and remedy
Refer to the page on the trouble-
shooting of the high pressure sen-
sor.
Refer to the page on refrigerant
amount evaluation.
Check the temperature and the pres-
sure of the sensor on the LED moni-
tor.