Toshiba Carrier RAS-12EKCV-UL Service Manual page 77

(3) Only the indoor motor fan does not operate
<Primary check>
1. Is it possible to detect the power supply voltage (AC208–230V) between
2. Does the indoor fan motor operate in cooling operation?
(In heating operation, the indoor fan motor does not operate for approximately 10 minutes after it is turned
on, to prevent a cold air from blowing in.)
( RAS-09EKCV-UL)
<Check procedure>
Shut off the
power supply once.
Turn the power supply.
Does the fan stop in
no operating status?
YES
Does an operation
LED 1 Hz blink?
YES
Start the operation
with low fan setting
in cool operation.
Does the fan rotate?
YES
Does the fan motor
operate smoothly?
YES
Change the setting of
cooling to high fan.
Does the fan speed
become higher?
YES
Normal
NO
Control P.C. board is defective.
Check connecting
NO
cable or power
supply cord complely?
YES
Check 5V at
display unit?
YES
NO
Does AC 115 V
or higher voltage apply
to between red and black
lead of fan motor?
NO
YES
Shut off the power supply.
Does the cross flow
fan rotate normally?
YES
Turn on the power supply.
NO
Operation
stops
Is the rotation signal (DC+5 V 0 V)
k
output between (gray lead wire)
l
and (brown lead wire) of the motor
connector (CN33) when rotating the
cross flow fan by hand in no operating
status? (1 pulse/one turn)
YES
Replace the control
P.C. board.
NO
NO
Change Display unit
NO
Replace
NO
bearing of cross
flow fan
NO
– 77 –
FILE NO. SVM-13071
and on the terminal block?
L1 L2
Replace the P.C. board.
Reconecting the
interconnetion cable
and terminal
block.
Check 5V at
NO
Main P.C. Board?
YES
Replace the fan motor.