Mitsubishi Heavy Industries SRK25GZ-L1 Handbook page 925

Error display : e37
9
Indoor unit
Red LED Stays OFF
Green LED Keeps flashing
Is the outdoor
unit heat exchanger
themistor connector
OK?
NO
Repair
e38
Error display :
10
Indoor unit
Red LED Stays OFF
Green LED Keeps flashing
Is the outdoor
air temperature thermistor
connector connection
OK?
NO
Repair
[Defective outdoor unit heat exchanger thermistor]
Outdoor unit
Red LED
Green LED
Are the outdoor
YES unit heat exchanger themistor
characteristics OK, is there
any broken wire?
NO
Defective outdoor unit
heat exchanger thermistor
Replacement
[Defective outdoor temperature thermistor]
Outdoor unit
Red LED
Green LED
Is the outdoor
YES
temperature thermistor
characteristics OK, is there
no broken wire?
NO
Defective outdoor tempera-
ture thermistor
Replacement
1 time flash
Keeps flashing
Defective outdoor unit PCB
YES
Replacement (Defective outdoor
unit heat exchanger themistor
input circuit)
15
10
5
1 time flash
Keeps flashing
Defective outdoor unit PCB
YES Replacement (Defective outdoor
temperature thermistor input
circuit)
Temperature-resistance
characteristics of outdoor
temperature thermistor (Th
400
300
200
100
0
---50
FDC-HKX
Outdoor unit heat exchanger
themistor (Th R) Resistance
O-
temperature characteristics
5kΩ at 25°C
0 10 20 30 40
Temperature (°C)
A)
O-
40
30
20
T < 0°C
T > 0°C
10
0
0 50
Temperature [T](°C)
923
50