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Troubleshooting Based on Equipment Condition
Si21-205
122
Troubleshooting
Troubleshooting
YES
YES
YES
NO
Turn on the power
switch or replace fuse.
NO
NO
YES
Replace the magnetic
switch or power
transistor.
Replace the PC board.
Replace the
compressor.
Check the thermistor.
NO
Air sensor
Indoor unit
PC board
Outdoor unit
PC board
Relay
Magnetic
switch
COMP
Input
to PC
board
Input
to PC
board
Output
from
PC
board
Output from
relay or
microcomputer
Output from
magnetic
switch or SW
circuit of
power
transistor
Output from
magnetic
switch or
U,V,W of
power
transistor
· Indoor unit fan runs at set airflow rate.
· (In cooling operation)
When air thermistor ambient temperature is higher than set temperature
· (In heating operation)
When air thermistor ambient temperature is lower than set temperature
Is the power
switch OFF or the fuse for
power switch
blown?
Is rated voltage
output from the magnetic
switch or power
transistor?
Is rated voltage output
from the PC board?
Is rated voltage
applied at
the compressor
terminals?
Caution
Be sure to turn off power switch before connect or disconnect connector,
or parts damage may be occurred.
(S2576)
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 ...