Outdoor Air Thermistor Error - Daikin VAM 350GJVE Service Manual

Heat reclaim ventilation
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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
(short-circuit).
Possible Causes
Troubleshooting
Note:
Note 1:
Refer to the thermistor temperature - resistance conversion table when measuring resistance.
Thermistor temperature - resistance conversion table
Thermistor
temperature
-10ºC or less
If measured value deviates significantly from above values, thermistor is faulty.
Use tester to check resistance
40
65
Inspection OFF Unit No. Blinking
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
-5ºC
Approx. 85kΩ
0ºC
Approx. 66kΩ
5ºC
Approx. 51kΩ
10ºC
Approx. 40kΩ
14ºC
Approx. 33kΩ
16ºC
Approx. 30kΩ
18ºC
Approx. 27kΩ
20ºC
Approx. 25kΩ
5
Is
NO
YES
Thermistor
temperature
22ºC
24ºC
26ºC
28ºC
30ºC
35ºC
40ºC
50ºC 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
Si71-502

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