Mitsubishi Electric CITY MULTI PUHY-400YMF-C Service Handbook page 158

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.
1500 Overcharged 1. When discharge superheart
refrigerant 10 deg is keeping for 10 minutes
abnormality or discharge superheat
deg for 15 minutes, outdoor unit
stops once, and after 3 minutes,
the unit restarts.
For 60 minutes after unit stopped
is intermittent fault check period.
2. When discharge superheart
10 deg is keeping for 10 minutes
or discharge superheat
deg for 15 minutes again (sec-
ond time), the unit stops and er-
ror code 1500 is displayed.
3. In case of SW2-6 ON, the de-
tection for the second time is fol-
lowed by the first time.
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) Excessive refrigerant charge.
2) Broken wire of liquid level heater.
3) Poor heater output caused by con-
20
trol circuit board trouble.
4) Thermistor trouble (TH2, TH3, TH4).
5) Thermistor input circuit trouble on
control circuit board.
6) Poor mounting of thermistor.
(TH11, TH12, TH2, TH3, TH4,
20
TH10a, TH10b)
7) Constant capacity unit SV5b error
8) Constant capacity unit LEV2 error
-155-
Checking method & Countermeasure
See Trouble check of pressure sen-
sor.
See Refrigerant amount check.
Check resistance of thermistor.
Check temperature and pressure of
sensor with LED monitor.
Check thermistor mounting
See solenoid valve troubleshooting
See LEV troubleshooting