Sunlight Supply Samsung Programmable Thermostat for Split Systems - Manual (Page 98)

12-35 Samsung Electronics
12-2-3 The Outdoor unit Fan error
1. Checklist:
1) Are the input power voltage and power connection correct?
2) Is the motor wire connected to the outdoor PCB correctly?
3) Is there no obstacle at the surrounding of motor and propeller?
4) Does the driver in the motor case broken?
2. Troubleshooting procedure
# TEST operation #
press K900 button on the
MAIN PCB after power on.
- once : cooling mode
- twice in a second :
heating mode
Exchange INVERTER PCB
Exchange INVERTER PCB
No
Yes
Yes
Yes
No
Check the connection of CN40 and CN41
Is the connection of FAN housing certainly to
PCB socket?(CN40, CN41)
Exchange the FAN motor because of driver
inside of the motor case broken
No
Take off each Fan motor housing after 1 minutes
from turning off the power
Follow the check procedure of
outdoor unit power supply error check
No
Is each resistance of FAN cable housing
pin #1-#3 over 1Mohm, pin #4-#3, #5-#3 and
#6-#3 over 1Kohm on each FAN motor?
Mount each Fan housing to PCB socket and
turn on the power
Exchange INVERTER PCB
No
Is the Pin voltage #1 - #3 of CN40 and 41
over 250V?
Exchange the FAN motor not in rotation
No
Exchange INVERTER PCB
Yes
Exchange the FAN motor
No
Yes
Yes
Yes
No
Is the Pin voltage #5 - #3 of CN40 and 41 15V?
Is the Pin voltage #5 - #3 of CN40 and 41
within 1-6V during the operation?
Is the Fan in rotation during
TEST operation in cooling mode
Is the Pin voltage #6 - #3 of CN40 and 41
changed high(4-5V) and low(0-1V) in case of
making manual rotation slowly?
Is the Pin voltage #7 - #3 of CN40 and
41 low(0-1V) in normal rotation?
Yes