Daikin FHQ100BUV3B, Service Manual

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ESIE05-04 Troubleshooting
Part 3 – Troubleshooting 3–9
3 3
4
5
1
Troubleshooting
Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be
occurred.
YES
YES
YES
NO
NO
YES
Normal.
(Thermostat OFF by
outdoor temperature)
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
e
Output from
relay or
microcomputer
d
Output from
magnetic
switch or SW
circuit of
power
transistor
c
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?
d
Is rated voltage
output from the magnetic
switch or power
transistor?
e
Is rated voltage output
from the PC board?
Is the heating
switch turned on at outdoor
temperature >30˚C
c
Is rated voltage
applied at
the compressor
terminals?
(S2576)