Outdoor Air Thermistor Error - Daikin VAM 150FJVE Service Manual

Troubleshooting
1.5

Outdoor Air Thermistor Error

Remote Controller
Error Code
LCD Display
LED Indication
Remote Controller
Error Detection Temperature detected by outside air temperature sensor is used to detect errors.
Method
Error Generating When value detected by outside 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°C or less
If measured value deviates significantly from above values, thermistor is faulty.
Use tester to check resistance
38
6 6 6 6 5 5 5 5
—
Inspection
4
Main Unit
Faulty sensor
Broken wire
Faulty control PCB
Faulty contact in connector
Remove outdoor air
thermistor (R2T) from
X13A (2P) on control
PCB, and measure
resistance.
thermistor
normal?
Note 1
Sensor resistance
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°C
24°C
26°C
28°C
30°C
35°C
40°C
50°C or more
Continuity check
Replace outdoor
air thermistor.
If there is no faulty
contact, replace
control PCB.
(HF004)
Sensor resistance
Approx. 23kΩ
Approx. 21kΩ
Approx. 19kΩ
Approx. 18kΩ
Approx. 16kΩ
Approx. 13kΩ
Approx. 11kΩ
7kΩ or less
(HL028)
Troubleshooting
SiE00-01