Daikin RZQ140B7W1B [157/326] Caution be sure to turn off power switch before connect or disconnect connector or parts damage may be occurred

Daikin RZQ140B7W1B [157/326] Caution be sure to turn off power switch before connect or disconnect connector or parts damage may be occurred
ESIE05-03 Troubleshooting
Part 3 Troubleshooting 3–9
33
4
5
1
Troubleshooting
Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage may be
occurred.
Output
from
PC
board
Is the power
switch OFF or the fuse for
power switch
blown?
Is the
heating switch
turned on at outdoor
temperature
>30˚C
YES
c
Is rated
voltage applied at
the compressor
terminals?
d
Is rated voltage
output from the magnetic
switch or power
transistor?
e
Is rated voltage
output from the
PC board?
YES
YES
· 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
Indoor unit
PC board
Outdoor unit
PC board
Relay
c
Output from
magnetic
switch or
U,V,W of
power
transistor
d
Output from
magnetic
switch or SW
circuit of
power
transistor
e
Output from
relay or
microcomputer
Input
to PC
board
Input
to PC
board
(S257
6)
NO
NO
YES
NO
NO
YES
NO
A
ir sensor
Magnetic
switch
COMP
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.
ESIE05-03.book Page 9 Wednesday, April 6, 2005 4:09 PM

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