Mitsubishi Heavy Industries SCM71ZS-W User Manual

-
151
-
'19 • SCM-SM-276
Error code
Remote control:
LED Green Red
Indoor
Outdoor
Content
E53
Suction pipe temperature
sensor anomaly
Keeps ashing
Stays OFF
– 8
-
time ash
1. Applicable model
5. Troubleshooting
All models
Diagnosis Countermeasure
Is
the suction pipe
temperature sensor connector
connected properly?
YES
Is the
characteristics of the
suction pipe temperature
sensor
OK?
NO
For the characteristics of suction pipe
temperature sensor, see the following graph.
YES
Temperature-resistance characteristics
15
10
5
0 10 30 4020 50
NO
Temperature sensor resistance (kΩ)
Temperature (°C)
5kΩ at 25°C
(Broken wire)
(Short-circuit)
Correct connector.
Defective suction pipe
temperature sensor
→
Replace.
Defective outdoor unit sub
PCB
→
Replace.
(Defective suction pipe
temperature sensor input
circuit)
2. Error detection method
Detection of anomalously low
temperature (resistance) on
suction pipe temperature sensor
3 . Condition of error displayed
• When the temperature sensor
detects -55 °C or lower for 5
seconds continuously within
2 minutes to 2 minutes 20
seconds after the compressor
ON, the compressor stops.
After 3-minutes delay, the
compressor starts again
automatically, but if this
anomalous temperature is
detected 3 times within 40
minutes.
• When -55 °C or lower is
detected for within 20 second
after power ON.
4. Presumable cause
• Defective outdoor unit sub
PCB
• Broken sensor harness or
temperature sensing section
(Check molding.)
• Disconnected wire connection
(connector)
Note:

Mitsubishi Heavy Industries SCM71ZS-W Specifications

General

Brand	Mitsubishi Heavy Industries
Model	SCM71ZS-W
Category	Air Conditioner
Language	English