Not familiar with the LG line, but thermisters come to mind.

 

the fans run continuous on mini split since they read the temperature @ the return air thermistor not @ the remote.

 

So this is normal behavior that I'm experiencing? If so, I am wondering why the digital gauge 10 feet away up and downstairs is 3-4 degrees above whatever the thermistor is reading? You would think that with a setpoint at 19 and that temperature is achieved, the place wouldn't heat up to 23.

 

My mini-split maintains set point without issues. Not sure what's going on with yours. Check the manual as some units allow you to input a temperature offset. I wonder if your installer may of accidentally done this.

 

Hmm, nothing in the manual about a temperature offset. Maybe this unit should be installed with a wired thermostat with an accurate temp gauge. The one on the unit doesn't seem to work. Came home tonight and it's now 24celsius in here and it's still blowing hot air. Our installer was HVI certified but seemed to have little knowledge of the product. I guess I'll give them a shout tomorrow. Hopefully they can get some answers for me.

 

My YMGI did this right after it was installed too. HVAC guy diagnosed a bad board in the indoor unit. Replaced the next day and its been fine ever since. Have your installer come back to check yours out. It definitely shouldn't be running in the manner you describe.

 

I have been doing some research and have found that LG units tend to blow 4celsius warmer when in heating mode. This has been true for both wall units at our place. I now have set the temps to 16 degrees and they heat the place up to 20 degrees. At 17, they give 21 and so on. Kind of a weird thing. Since both of them are doing this, I can probably assume it isn't a faulty board in a brand new unit. But you never know.

 

The symptom with mine was that once started, it wouldn't turn off the outdoor unit unless I physically changed modes. This happened even when I manually set it back to the lowest temp setting. Heating mode would continue. At 80 degrees Fahrenheit indoor and still rising with temp set to 60 degrees I called my HVAC guy back in. With the new board, it maintains a room temp that's within a degree or so of the setpoint. It also attempts to keep the outdoor running at the lowest possible compressor power setting (its DC inverter powered) until the temp is 1 degree hotter, then it powers off the outdoor unit. Because of this, when its cool enough outside, the outdoor unit runs constantly and heat output varies as it adjusts compressor power to meet the heating demand.

Your LG unit might be somewhat different, but if it won't turn off and the temp keeps rising even at the lowest setpoint setting then you have an issue.

 

At a remote setting of 16 and 17 celsius (in heating mode) it actually does stop running now. The outdoor compressor does shut down, or at least ramp down. It is dropping close to 3 degrees overnight lately and the system is still holding at 4 degrees over the setpoint.

I've also learned that there is supposedly a "dip switch" somewhere inside the wall units that can be set to 1 degree above set point and also 4 degrees above setpoint. These would depend on the location on the wall (ie. high ceilings, regular ceilings, etc).

I'm still observing the behavior of the units before calling the tech in. They are like little robots with their own mind sometimes (the wall units, not the techs, lol).

 

tell me about it. Mine's pretty impressive. Its 800 watt maximum current draw has so far fully made up for 2700 watts of electric baseboard heaters that it is replacing. They used to run full blast when the outside temp dropped to freezing. I know for a fact that the mini-split isn't drawing near that yet. The thing is whisper quiet too and there's no ductwork related efficiency loss either.

My only gripe is the weird "sleep mode" (manual only) and lack of a true timed setback. I can do a timed on/off but there's no way to drop the temp 3 degrees at 10PM and warm back up at 6AM..

So every night before retiring, I have to manually turn it down 3 degrees then turn it back up in the morning. :gah: