Midea MS9A-05CR-QD0 Service Manual page 61

Main parts check
1. Temperature sensor checking
Disconnect the temperature sensor from PCB, measure the resistance value with a tester.
Temperature Sensors.
Room temp.(T1) sensor,
Indoor coil temp.(T2) sensor,
Outdoor coil temp.(T3) sensor,
Outdoor ambient temp.(T4) sensor,
Compressor discharge temp.(T5) sensor.
Measure the resistance value of each winding by using the multi-meter.
Table1:Some frequently-used R-T data for T1,T2,T3 and T4 sensor:
Temperature (℃)
Resistance Value (KΩ)
Table 2:Some frequently-used R-T data for T5 sensor:
Temperature (℃)
Resistance Value (KΩ)
Resistance value (KΩ)
5 10
26.9 20.7
5 15
141.6 88
T5
T1,T2,T3,T4
15 20 25 30
16.1 12.6 10 8
25 35 60 70
56.1 36.6 13.8 9.7
Temperature (℃)
59
40 50 60
5.2 3.5 2.4
80 90 100
6.9 5 3.7