Mark Weiss
New Member
My new LG air conditioner, 24,000 BTUs, is just out of warranty. It replaced a trusty old Emerson Quiet Kool unit that's served me since 1984. During a recent remodel, I replaced that noisy old energy hog with the LG from Home Depot. It's in the ceiling of the basement, in a corner between two walls. Not really accessible. I used to turn the old unit on off via circuit breaker, which can be reached without a ladder. The LG operates via a handy remote control.
This unit worked fine until today. When I shut off the unit, the display went dark as usual and the fan stopped, but I could still hear the compressor humming.
I shut off the breaker to this a/c for a while and later turned it back on. The compressor came on, despite the unit being in the 'off' state. If I turn the unit on, the fan comes on and it cools the room.
I'm thinking there is a relay that controls the compressor and perhaps the contacts got welded shut so it won't disengage. If the controlling electronics is immediately behind the plastic front panel, I may be able to get to it on a ladder. It's somewhat recessed into the wall, which is about 22" thick. I'm thinking either a stuck contactor/relay or something wrong with the controller PCB.
Ideas or suggestions welcome.
ADDITIONAL INFO:
I pulled the plug and measured hot to hot 2.5 ohms. This suggests it's not the controller, but a contactor that welded shut.. the compressor is connected to LINE even when off.
This unit worked fine until today. When I shut off the unit, the display went dark as usual and the fan stopped, but I could still hear the compressor humming.
I shut off the breaker to this a/c for a while and later turned it back on. The compressor came on, despite the unit being in the 'off' state. If I turn the unit on, the fan comes on and it cools the room.
I'm thinking there is a relay that controls the compressor and perhaps the contacts got welded shut so it won't disengage. If the controlling electronics is immediately behind the plastic front panel, I may be able to get to it on a ladder. It's somewhat recessed into the wall, which is about 22" thick. I'm thinking either a stuck contactor/relay or something wrong with the controller PCB.
Ideas or suggestions welcome.
ADDITIONAL INFO:
I pulled the plug and measured hot to hot 2.5 ohms. This suggests it's not the controller, but a contactor that welded shut.. the compressor is connected to LINE even when off.
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