LG heating and cooling equipment carry the build date inside the serial number. We know one serial format for this brand; the decoder tries each one and shows every reading that fits.
LG plates usually print MANUFACTURED followed by the year and month. Use that if present.
The first digit is the last digit of the year and the next two digits are the month. The decade is not encoded.
404KAPB00104 reads as April 2024 or April 2014 or April 2004.
Two sources agree Building Intelligence Center, HomeSpy
A ductless mini-split is a heat pump, so plan on 10 to 15 years, with 20 possible for a lightly used unit that is cleaned regularly.
How long does a ductless mini-split last? · Should I replace my air conditioner? · same range as air-source heat pumps
Mitsubishi Electric · Fujitsu · Gree · Bosch (heat pumps and geothermal) · ClimateMaster · WaterFurnace
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The age you just looked up is the kind of fact that gets lost. A written record of serial numbers, install dates, repairs and who did the work saves the next owner, inspector or insurer from guessing.
A lifetime logbook for the house, organized by system, with room for serial numbers, install dates, repairs and contractors. It stays with the house for the next owner.
Galvanized, polybutylene, cast iron and the sewer line: what fails, what it costs, what insurance won't cover and how to decide.
A buyer's guide to older homes: wiring, pipes, lead, asbestos, insurance refusals and what the repairs actually cost.
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