Mitsubishi Electric CITY MULTI PUHY-P200YEM-A Service Handbook page 126

Checking code Meaning, detecting method
If the discharge SH ≤ 10K is
1.
1500 Overcharged
detected during operation (at
refrigerant
first detection), the outdoor
abnormality
unit stops at once. The 3-
minute restart prevention
mode is entered. After three
minutes, the outdoor unit
starts up again.
If the discharge SH ≤ 10K is
2.
detected again within 30
minutes after the outdoor unit
stops (second detection), an
abnormal stop is applied, and
"1500" is displayed.
If discharge SH ≤ 10K is
3.
detected more than 30
minutes after the outdoor unit
stops, the state is the same
as the first detection and the
same operation as 1 above
takes place.
The abnormal stop delay
4.
period is in effect for 30
minutes after the outdoor unit
stops. The abnormal stop
delay period LED turns ON
during this time.
If the abnormality detection
5.
prohibit switch (SW2-4) is
ON, the same operation as
the first detection will apply
for the second and following
detections.
– 1) Excessive refrigerant charge.
2) Main circuit board thermistor
input circuit trouble
Thermistor mounting trouble
3)
(TH1, TH2)
–
–
- 125 -
Cause
Refer to the section on judging the
refrigerant volume.
Check the sensor detection
temperature and pressure with
the LED monitor.
Checking method