Troubleshooting for Indoor Unit
Si21-205
152
Troubleshooting
5.8
Malfunction of Heat Exchanger Thermistor (R2T)
Remote
Controller
Display
C4
Applicable
Models
FFQ-B, FHQ-BU
Method of
Malfunction
Detection
Malfunction detection is carried out by temperature detected by heat exchanger sensor.
Malfunction
Decision
Conditions
When the heat exchanger thermistor becomes disconnected or shorted while the unit is running.
Supposed
Causes
Failure of the sensor itself
Broken or disconnected wire
Failure of electronic circuitry (indoor unit PC board)
Failure of connector contact
Troubleshooting
Check No.2
Refer to P.163
Disconnect the heat exchanger
sensor (R2T) from X18A on
the indoor unit PC board and
measure the resistance.
Connect correctly.
Heat exchanger
sensor replacement.
If contact is OK,
replace indoor unit
PC board.
Is the
thermistor normal?
(See note)
NO
NO
YES
YES
(S2734)
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.
Содержание Sky Air B-Series R-410A
Страница 7: ...Si21 205 vi Table of Contents ...
Страница 15: ...Models Si21 205 4 Model Name and Power Supply ...
Страница 16: ...Si21 205 Functions 5 Part 2 Functions 1 List of Functions 6 ...
Страница 35: ...Wireless Remote Controller Si21 205 24 Remote Controller ...
Страница 77: ...Settings Concerning Maintenance Si21 205 66 Field Setting FHQ B Service monitor LED Capacity setting adaptor ...
Страница 79: ...Settings Concerning Maintenance Si21 205 68 Field Setting Detail of PCB 2 ...
Страница 83: ...Maintenance Mode Setting Si21 205 72 Field Setting ...
Страница 239: ...Troubleshooting for Outdoor Unit 50 60 class Si21 205 228 Troubleshooting ...
Страница 246: ...Si21 205 FFQ25 35 50 60BV1B Removal Procedure 235 4 Remove the horizontal vane Step Procedure Points S2646 ...
Страница 283: ...Outdoor Unit 25 35 class Si21 205 272 Removal Procedure 2 Slide the MID upward and release Step Procedure Points ...
Страница 285: ...Outdoor Unit 25 35 class Si21 205 274 Removal Procedure 4 Remove the fan motor Step Procedure Points ...
Страница 321: ...Outdoor Unit 50 60 class Si21 205 310 Removal Procedure ...