Samsung Electronics
32
Troubleshooting
6-3-5 In the HEAT mode, When there is no warm air current. Check this fist;
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?
No
Yes
Yes
Yes
After training on, the heating operation
should start in 5 minutes.
4-Way valve should be replaced
or connecting Cable Check.
No
No
Abnormal Micom
Is the number checking
#13 of IC05 (ULN2003A) LOW?
Is the number #38 of Micom (IC04)
DC5.0V?
No
Abnormal IC05
Is the voltage between
CN71 #1 and CN71 #5 rating voltage
±10% range
No
Abnormal RY73
PCB should be replaced.
Abnormal 4-Way valve of Outdoor Unit.
or connecting Cable
Abnormal Micom
Summary of Contents for US18WJWB
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