Daikin RZQ100B8V3B Service Manual page 157

ESIE05-03
Troubleshooting
Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be
occurred.
Part 3 – Troubleshooting
· 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?
NO
Is the
heating switch
turned on at outdoor
temperature
>30˚C
NO
Is rated
voltage applied at
the compressor
terminals?
NO
Is rated voltage
output from the magnetic
switch or power
transistor?
NO
Is rated voltage
output from the
PC board?
NO
Air sensor
Indoor unit
PC board
Input Output
to PC from
board PC
board
YES
YES
YES
YES
YES
Outdoor unit Magnetic
PC board
switch
Relay
Input
Output from Output from
relay or magnetic
to PC
microcomputer
switch or SW
board
transistor
Troubleshooting
Turn on the power
switch or replace fuse.
Normal.
(Thermostat OFF by
outdoor temperature)
Replace the
compressor.
Replace the magnetic
switch or power
transistor.
Replace the PC board.
Check the thermistor.
COMP
Output from
magnetic
switch or
circuit of U,V,W of
power power
transistor
(S2576)
1
3 3
4
5
3–9