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Troubleshooting for Indoor Unit
Si21-205
154
Troubleshooting
5.10 Malfunction of Suction Air Thermistor
Remote
Controller
Display
C9
Applicable
Models
FFQ-B, FHQ-BU
Method of
Malfunction
Detection
Malfunction detection is carried out by temperature detected by suction air temperature sensor.
Malfunction
Decision
Conditions
When the suction air temperature sensor’s thermistor becomes disconnected or shorted while
the unit is running.
Supposed
Causes
Failure of the sensor itself
Broken or disconnected wire
Failure of indoor unit PC board
Failure of connector contact
Troubleshooting
Check No.2
Refer to P.163
Disconnect the sunction air
temperature sensor (R1T)
from X19A on the indoor unit
PC board and measure the
resistance.
Connect correctly.
Suction air temperature
sensor replacement.
If contact is OK, replace
outdoor unit PC board.
Is the
thermistor normal?
(See note)
NO
YES
(S2012)
NO
YES
Check contact of connector
Is it normal?
See
Check No. 2
for “Thermistor temperature and resistance characteristics”.
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
Summary of Contents for Sky Air B-Series R-410A
Page 7: ...Si21 205 vi Table of Contents ...
Page 15: ...Models Si21 205 4 Model Name and Power Supply ...
Page 16: ...Si21 205 Functions 5 Part 2 Functions 1 List of Functions 6 ...
Page 35: ...Wireless Remote Controller Si21 205 24 Remote Controller ...
Page 79: ...Settings Concerning Maintenance Si21 205 68 Field Setting Detail of PCB 2 ...
Page 83: ...Maintenance Mode Setting Si21 205 72 Field Setting ...
Page 239: ...Troubleshooting for Outdoor Unit 50 60 class Si21 205 228 Troubleshooting ...
Page 321: ...Outdoor Unit 50 60 class Si21 205 310 Removal Procedure ...