LG AS-W1863 Series Svc Manual page 73

The heater does not operate at all.
Trouble 6
Check the wire connection of PTC Heater (Refer to Wiring Diagram)
• Check the connecting condition of CN-PTC connector on the indor DC P.C.B Ass'y.
• Check the soldering condition of CN-PTC connector on the indoor DC P.C.B Ass'y.
Check the Heater driving Circuit.
• Check the pattern between MICOM Pin No.
If there is no problem result of all above check.
• Inner side disconnection of PTC Heater unit or restriced operating condition of PTC Heater
(pipe temp. is over 45°C, defrosting operation, compressor off, indoor fan off).
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Only for training and service purposes
Turn off main power
¡ IC02M Pin No.
48
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Troubleshooting Guide
¡ IC02M Pin No. ¡ CN-PTC
7 10
LGE Internal Use Only