Daikin SkyAir RZQ200 · 250C7Y1B Service Manual page 97

Troubleshooting Based on Equipment Condition
Troubleshooting
86
Be sure to turn off power switch before connect or disconnect connector,
Caution
or parts damage may be occurred.
· 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 ≥27˚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
Output
Input
from
to PC
PC
board
board
YES
YES
YES
YES
YES
Magnetic switch or
Outdoor unit
PC board
Power transistor
Relay
Output from
Input
relay or
to PC
microcomputer
board
SiBE26-701
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
Compressor
switch or
UVW circuit
of power
transistor
(S2576)
Troubleshooting