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LW1816HR LG window AC - compressor stays running when fan shuts off

Joined
Sep 16, 2020
Messages
1
Location
Florida
Model Number
LW1816HR
Brand
LG
Age
1-5 years
LW1816HR LG window AC unit with heat

I have LG window ac with heat model LW1816HR the compressor stays running when fan shuts off ?
 

Dan O.

Appliance Tech
Staff member
Joined
Oct 9, 2004
Messages
4,169
Location
Ontario, Canada
I’ve never done electronic repairs and don’t know where you'd find an appropriate replacement component. Usually when a control fails the whole thing is replaced with the factory replacement.

Dan O.
 

PamelaG

Premium Member
Joined
Jun 23, 2021
Messages
2
Location
Whitney TX
Gee Dan,
seems kinda sillu when I'm tapping on the relay with a screwdriver to get it to shut offl Pretty sure all I need is the relay.
(Don't do electronic appliances...been mechanicing for years.....concept is the same.
 

Jhood78

Premium Member
Joined
Jul 5, 2021
Messages
2
Location
Ny
I have an lg LW1515ER with the constant running compressor. What i did to fix it (so far anyway) was traced the compressor wires back to the control board where i found a brown wire and a black wire attached to a relay- what i did was disconnect the brown wire (while unit was still plugged in but turned off - compressor still running) and then attempted to touch the contacts together (from lead to relay).

Be careful, shock risk, you'll see the sparks fly. After that i simply unplugged the unit and reinstalled the brown wire and plugged the unit back in. Now, the compressor cycles regularly and if you switch to fan (or adjust temp up to turn off the compressor) and back to cool - after 3 minutes the unit behaves as it should. So, try that and good luck.

I also agree about just replacing the relay. With a little electrical know how, there's no reason i can see that any 110v relay capable of carrying at least 15amps (mine draws 12amps running - maybe up to 18amps or so on start-up) though -didn't check) wouldn't work as long as the other circuits are complete.

From what i saw there are only the 2 wires (1in and 1 out) so its really as simple as that. If mine ever decides to quit again, thats what ill do. There's plenty of space in there to just disconnect the old and reconnect a new one without further breakdown of the control board or even attaching it to the control board permanently. Good luck
 

Dan O.

Appliance Tech
Staff member
Joined
Oct 9, 2004
Messages
4,169
Location
Ontario, Canada
i found a brown wire and a black wire attached to a relay- what i did was disconnect the brown wire (while unit was still plugged in but turned off - compressor still running) and then attempted to touch the contacts together (from lead to relay)

I wouldn't suggest anyone attempt that.

Besides being dangerous, it is more likely to do more damage than 'fix' anything. At least it runs and is cooling now. Blow up the electronic control and you won't even be able to use it!

JMO

Dan O.
 

Jhood78

Premium Member
Joined
Jul 5, 2021
Messages
2
Location
Ny
I also add wiring to live circuits without shutting off the breakers first.
It works on most relays that are "welded" shut. Here's some reading. Once you understand the phenomenon than you can control it. te.com/usa-en/products/relays-contactors-switches/relays/intersection/contact-arc-phenomenon.html?tab=pgp-story
 
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