Daikin VAM 500EJ, Service Manual

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Si-93 Troubleshooting
Troubleshooting 35
1.5 Outdoor Air Thermistor Error
Remote Controller
LCD Display
Error Code
666
65555
Inspection
—
Unit No.
5
LED Indication Remote Controller
4
Main Unit
5
Error Detection
Method Temperature detected by outside air temperature sensor is used to detect errors.
Error Generating
Conditions
When value detected by outside air temperature sensor is -40ºC or below (open circuit) or 70ºC or higher
(shorting).
Possible Causes
■
Faulty sensor
■
Broken wire
■
Faulty control PCB
■
Faulty contact in connector
Troubleshooting
Note: Note 1:
Refer to the thermistor temperature - resistance conversion table when measuring resistance.
Thermistor temperature - resistance conversion table
If measured value deviates significantly from above values, thermistor is faulty.
Use tester to check resistance
Remove outdoor air
thermistor (R2T) from
X13A (2P) on control
PCB, and measure
resistance.
Is
thermistor
normal?
Note 1
YES
NO
Replace outdoor
air thermistor.
If there is no faulty
contact, replace
control PCB.
(HF004)
Thermistor
temperature Sensor resistance Thermistor
temperature Sensor resistance
-10ºC or less 108k
Ω
or more 22ºC Approx. 23k
Ω
-5ºC Approx. 85k
Ω
24ºC Approx. 21k
Ω
0ºC Approx. 66k
Ω
26ºC Approx. 19k
Ω
5ºC Approx. 51k
Ω
28ºC Approx. 18k
Ω
10ºC Approx. 40k
Ω
30ºC Approx. 16k
Ω
14ºC Approx. 33k
Ω
35ºC Approx. 13k
Ω
16ºC Approx. 30k
Ω
40ºC Approx. 11k
Ω
18ºC Approx. 27k
Ω
50ºC or more 7k
Ω
or less
20ºC Approx. 25k
Ω
Continuity check
(HL028)