Mitsubishi Heavy Industries SRK20ZJ-S Service Manual

-
93
-
'10 • SCM-SM-094
Error code
Remote controller:
LED Green Red
Indoor
Content
E7
Return air temperature
thermistor anomaly
Keeps flashing 1 time flash
Outdoor
– Stays OFF
1. Applicable model
5. Troubleshooting
All models
Diagnosis Countermeasure
NO
NO
YES
Is the
connection of return
air temperature thermistor
connector OK?
Are the
characteristics of return air
temperature thermistor
OK?
YES
15
10
5
0 10 30 4020 50
Temperature-resistance characteristic
Temperature thermistor resistance (k)
Temperature (°C)
5k at 25
°C
(Broken wire)
(Shot circuit)
Correct.
ª
Connect
connector.
Defective return air
temperature thermistor
ª
Replace.
Defective indoor control
PCB
ª
Replace.
(Defective return air
temperature thermistor
input circuit)
2. Error detection method
Anomalously low temperature
or high temperature (resistance)
is detected by indoor return air
temperature thermistor (ThI-A)
3. Condition of Error displayed
• When the temperature thermistor
detects -50°C or lower for
5 seconds continuously, the
compressor stops. After 3-minute
delay, the compressor starts again
automatically, but if this error
occurs again within 60 minutes
after the initial detection.
4. Presumable cause
• Defective return air
temperature thermistor
connector
• Defective return air
temperature thermistor
• Faulty indoor control PCB
Note:

Mitsubishi Heavy Industries SRK20ZJ-S Specifications

General

Brand	Mitsubishi Heavy Industries
Model	SRK20ZJ-S
Category	Air Conditioner
Language	English