Photocatalytic Operation Does Not Activate - Daikin MC401VE Service Manual

Troubleshooting
1.4

Photocatalytic Operation does not Activate

Method of
Malfunction
Detection
Malfunction Photocatalytic operation does not activate during equipment operation (lamp does not light).
Decision
Conditions
Supposed
Causes
Troubleshooting
Check connector and harness
connection.
Check power supply voltage
between one of the pins for X9A
and X10A.
Refer the drawing next page.*
Check transformer secondary
voltage
(A1P-X4A).
Check power supply of inverter
PCB. (A3P-CN1)
24
Faulty lamp
Faulty transformer
Faulty PCB
Be sure to turn off power switch before connect or disconnect connector,
Caution or parts damage may be occurred.
Is connection
normal?
YES
Is voltage
between 220 to 240
VAC?
YES
Is voltage
higher than 12
VDC?
YES
Is voltage
higher than 12
VDC?
YES
Replace lamp or inverter
PCB A3P.
NO
*Make sure to press the door switch
(safety switch) DS1 before
checking voltage.
NO
NO
NO
SiE74-202
Correct connection
Replace control PCB (A1P)
Replace control PCB A1P.
• Check connector X4A and
CN1.
• Replace wire harness
between X4A of A1P and
CN1 of A3P.
(Z0008)
Troubleshooting