Why Your LG Aircon Light Is Blinking After Cleaning: Full Singapore Guide

LG Dual Inverter air conditioners are popular in Singapore for their energy efficiency and sleek design. However, homeowners are sometimes surprised when an LG indoor unit starts blinking its power LED or displays a **CH** error code immediately after routine filter washing or servicing. Post-cleaning blinking lights on LG systems are usually tied to physical cover microswitches, filter seating, or sensor clip positioning. ## Primary Factors Behind Post-Cleaning LG Blinking Lights When an LG aircon flashes its lights shortly after being cleaned, several common factors are typically responsible: * **Unseated Front Panel Safety Latch:** LG indoor units feature small plastic safety alignment pegs on the front cover. If the cover is not firmly pressed into its housing until it clicks, the safety microswitch remains open. * **Filter Mesh Misalignment:** Inserting air filters backward or failing to slide them fully into their guide tracks prevents the front intake panel from closing flush. * **Indoor Thermistor Displacement (Code CH01/CH02):** During coil cleaning, copper pipe thermistor clips can accidentally shift, causing the sensor to read ambient air instead of coil surface temperature. * **Uncleared Filter Cleaning Counter:** On selected LG models, the filter cleaning reminder icon must be manually cleared using the remote controller. Learn how [LG error codes and meanings](/blog/lg-aircon-error-codes-and-their-meanings) explain specific CH error triggers. ## Understanding LG Safety Interlock Mechanics LG indoor control boards incorporate safety microswitches to prevent the indoor blower wheel and louver stepper motors from operating while the front cover is open. If the front panel tabs do not compress the microswitch fully, the PCB registers an open cover status, pauses cooling operation, and blinks the LED indicator. Residents in [Ang Mo Kio](/locations/ang-mo-kio) or [Bishan](/locations/bishan) can verify that both left and right bottom corners of the LG front cover are clicked securely into place. ## Professional Technical Inspection If adjusting the front panel and filter mesh does not clear the blinking light, a physical inspection by a qualified technician is recommended. The engineer checks thermistor clip seating, inspects microswitch wiring, and verifies PCB signal continuity safely. All technical checks are performed in compliance with LG technical standards to restore smooth, quiet cooling. ## Frequently Asked Questions (AEO/SEO Snippet) ### Q: Why does my LG aircon display CH05 after cleaning? **A:** Code CH05 indicates a communication error between indoor and outdoor PCBs. It can occur after cleaning if the main power isolator was switched back on before signal connections dried completely. ### Q: How do I reset the filter light on my LG aircon remote? **A:** Press and hold the **LIGHT OFF** or **CLEAN** button on your LG wireless remote controller for 3 seconds to clear the filter sign counter. ### Q: Can water entry during cleaning damage my LG indoor sensor? **A:** High-pressure washing can temporarily alter thermistor resistance if moisture enters plug connectors. Allowing plugs to dry thoroughly usually restores normal sensor operation.