Indoor Air Thermistor Error - Daikin VAM 150FJVE Service Manual

SiE00-01
1.4

Indoor Air Thermistor Error

Remote Controller
Error Code
LCD Display
LED Indication
Remote Controller
Error Detection Temperature detected by inside air temperature sensor is used to detect errors.
Method
Error Generating When value detected by inside air temperature sensor is -40ºC or below (open circuit) or 70ºC or higher
Conditions
(shorting).
Possible Causes
Troubleshooting
Note: Note 1:
Refer to the thermistor temperature - resistance conversion table when measuring resistance.
Thermistor temperature - resistance conversion table
Thermistor
temperature
-10
If measured value deviates significantly from above values, thermistor is faulty.
Use tester to check resistance
Troubleshooting
6 6 6 6 4 4 4 4
—
Inspection
4
Main Unit
Faulty sensor
Broken wire
Faulty control PCB
Faulty contact in connector
Remove Indoor air
thermistor (R1T) from
X12A (3P) on control
PCB, and measure
resistance.
thermistor
normal?
Note 1
Sensor resistance
C or less 108kΩ or more
°
-5 C Approx. 85kΩ
°
0 C Approx. 66kΩ
°
5 C Approx. 51kΩ
°
10 C Approx. 40kΩ
°
14 C Approx. 33kΩ
°
16 C Approx. 30kΩ
°
18 C Approx. 27kΩ
°
20 C Approx. 25kΩ
°
5
Unit No.
5
Is
NO
YES
Thermistor
temperature
22
24
26
28
30
35
40
50 C or more
°
Continuity check
Troubleshooting
Replace indoor air
thermistor.
If there is no faulty
contact, replace
control PCB.
(HF003)
Sensor resistance
C Approx. 23kΩ
°
C Approx. 21kΩ
°
C Approx. 19kΩ
°
C Approx. 18kΩ
°
C Approx. 16kΩ
°
C Approx. 13kΩ
°
C Approx. 11kΩ
°
7kΩ or less
(HL028)
37