Correct.
Defective remote controller
temperature thermistor
ï‚Ž
Replace.
Defective remote controller
PCB
ï‚Ž
Replace.
(Defective remote
controller temperature
thermistor input circuit)
2. Error detection method
Detection of anomalously low
temperature (resistance) of
remote controller temperature
thermistor (Thc)
3
.
Condition of error displayed
• When the temperature
thermistor detects -50°
C or lower for 5 seconds
continuously, the compressor
stops. After 3-minutes delay,
the compressor starts again
automatically, but if this
anomaly occurs again within
60 minutes after the initial
detection.
4. Presumable cause
• Faulty connection of remote
controller temperature
thermistor
• Defective remote controller
temperature thermistor
• Defective remote controller
PCB
Note:
After 10 seconds has passed since remote controller thermistor was switched from valid to invalid, E28 will not be displayed even if
the thermistor harness is disconnected. At same time the thermistor is switched from remote controller thermistor to indoor intake air
temperature thermistor.
Even though the remote controller thermistor is set to be Valid, the intake air temperature displayed on remote controller for checking still
shows the value detected by indoor intake air temperature thermistor, not by remote controller thermistor.
Resistance-temperature characteristics of remote controller temperature sensor (ThC)
Temperature (°C)
Resistance value (kΩ)
Temperature (°C)
Resistance value (kΩ)
Temperature (°C)
Resistance value (kΩ)
Temperature (°C)
Resistance value (kΩ)
-30 88.05 -2 18.11 26 4.786 54 1.542
-29 82.81 -1 17.20 27 4.582 55 1.486
-28 77.90 0 16.33 28 4.388 56 1.432
-27 73.32 1 15.52 29 4.203 57 1.380
-26 69.03 2 14.76 30 4.027 58 1.330
-25 65.02 3 14.03 31 3.859 59 1.283
-24 61.27 4 13.35 32 3.699 60 1.237
-23 57.75 5 12.70 33 3.546 61 1.193
-22 54.46 6 12.09 34 3.401 62 1.151
-21 51.37 7 11.51 35 3.262 63 1.111
-20 48.48 8 10.97 36 3.130 64 1.072
-19 45.77 9 10.45 37 3.004 65 1.035
-18 43.22 10 9.956 38 2.883 66 0.9991
-17 40.83 11 9.490 39 2.768 67 0.9648
-16 38.59 12 9.050 40 2.658 68 0.9318
-15 36.48 13 8.632 41 2.553 69 0.9001
-14 34.50 14 8.235 42 2.453 70 0.8697
-13 32.63 15 7.860 43 2.357 71 0.8404
-12 30.88 16 7.503 44 2.266 72 0.8122
-11 29.23 17 7.164 45 2.178 73 0.7852
-10 27.68 18 6.843 46 2.094 74 0.7591
-9 26.22 19 6.538 47 2.014 75 0.7341
-8 24.85 20 6.248 48 1.938 76 0.7100
-7 23.55 21 5.973 49 1.864 77 0.6868
-6 22.33 22 5.711 50 1.794 78 0.6645
-5 21.18 23 5.462 51 1.727 79 0.6430
-4 20.10 24 5.225 52 1.663 80 0.6223
-3 19.07 25 5.000 53 1.601 81 0.6024
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