Samsung 4qt12whwe Service Manual page 19

Troubleshooting
5-3-5 In the HEAT mode, When there is no warm air current. Check this fist;
1. Checklist :
1) Is the set temperature of Remote Control lower than room temperature in Heat mode?
2) Is the Indoor PCB properly connected with the CN71 connector?
2. Troubleshooting procedure
After training on, the heating operation
should start in 5 minutes.
Is the number #38 of Micom (IC04)
Is the number checking
#11 of IC05 (ULN2003A) LOW?
Is the voltage between
CN71 #1 and CN71 #5 rating voltage
Abnormal 4-Way valve of Outdoor Unit.
or connecting Cable
4-Way valve should be replaced
or connecting Cable Check.
18
No
DC 5.0V?
Yes
Yes
±10% range
Yes
No
Abnormal Micom
No
Abnormal Micom
No
Abnormal IC05
No
Abnormal RY73
PCB should be replaced.
Samsung Electronics