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Thread: LG code C6
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05-08-2013, 04:17 PM #1
LG code C6
Hi all. I know - it's an LG! A12AWD, AS-W12PDGO, SP1 chassis. One of those 'Art Cool' interior units.
Called to unit which according to client is 'short of gas'. Absolute crap install, but the end result is error code C6. Excessive current at inverter.
Compressor does not run at all, but fan motor does. Fan motor runs for less than 1 minute and shuts down. This is repeated 4 times, and interior unit displays C6 and total unit shutdown. Disconnect compressor and the sequence is the same.
Resistances at compressor windings within the LG range of between 1 and 5 ohms each.
Yellow - Blue 2.5ohms,
Yellow - Red 2.7ohms,
Blue - Red 2.9ohms
I wouldn't have thought that the difference in resistances significant.
I've removed the PCB and have just kicked under my desk until I've some clue as to where the fault lies!
Any ideas??
Graham
en boca cerrada no entran moscas
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05-08-2013, 04:24 PM #2
Re: LG code C6
I would check if the compressor is down to earth and also if the output from the inverter is OK.
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05-08-2013, 08:25 PM #3
Re: LG code C6
Hi Graham,
This little nugget should help.
http://www.refrigeration-engineer.co...verter+testingHealth and safety first..........unless I'm in a hurry.
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05-08-2013, 08:32 PM #4
Re: LG code C6
Andy's Inverter Testing Guide.pdf
this is handy too- pity theres no mobile number for techy help!!!
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05-08-2013, 09:00 PM #5
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06-08-2013, 12:08 AM #6
Re: LG code C6
Thanks for your replies.
Forgot to add that I had already meggered the compressor and appears ok. Didn't get any output on compressor connector during the time the fan was running.
I'm tending to think it's the board, but will run through Andy's test guide.
Not too sure where to get LG parts here - could be interesting!!
Thanks, Grahamen boca cerrada no entran moscas
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07-08-2013, 10:32 PM #7
Re: LG code C6
Next....
Once again, thanks Andy for the test guide.
This has just got to be a LG thing - there are no terminals marked P and/or N! I guess that these measurements to be taken are within the SPM circuitry, not the Power Module.
There is a lot of soldered joints on the board that appear corroded/dull/dry. I'll photo and post when I have time.
Any other constructive comments welcomed - Hmmmm, I think!
Grahamen boca cerrada no entran moscas
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07-08-2013, 10:42 PM #8
Re: LG code C6
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10-08-2013, 07:58 PM #9
Re: LG code C6
Thanks IM. They have helped a little. I'm not a stranger to electronics, but would like to clear a couple of things in my head. (commonly known as the space between my ears -- I'll say it first!!)
I've sorted many non-inverter PCB problems, both interior and exterior, but this my first inverter problem. Maybe I've been lucky!
Are the P and N terminals that Andy refers to, the DC side of the rectifier bridges? And - is 320Vac normal at these terminals. I do not have P and N terminals as such on this LG board, but can easily get to the diode bridge joints.
Am I right in assuming that the voltage at compressor will be AC? If so, then the SPM is the actual inverter module for compressor control. What are the variables at compressor - voltage, frequency, or a combination of both?
Once again, thanks for the info guys.
Grahamen boca cerrada no entran moscas
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10-08-2013, 09:08 PM #10
Re: LG code C6
That's about my limit of inverter theory. The inner theory behind the development of these inverters still gets me a bit curfuzzled and I've just scratched the surface, read stuff about vector control which made no sense. Still trying to suss out what superheat is...
Spanks!Health and safety first..........unless I'm in a hurry.
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11-08-2013, 10:55 AM #11
Re: LG code C6
Thanks. I've just re-read my questions and realised I put 320Vac when I should have put Vdc.
I'm hoping to go back Monday or Tuesday to recheck. I'll update as and when!!
Superheat - I've heard the expression! Or is that what we are having today? Forecast of 32ºC +!
Grahamen boca cerrada no entran moscas
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11-08-2013, 08:06 PM #12
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13-08-2013, 09:16 AM #13
Re: LG code C6
Thanks IM. The article should make interesting reading.
Have now confirmed that the fault is with the exterior PCB. Rechecked compressor windings resistance and insulation. Managed to get a DC reading at rectifiers of 290Vdc, but nothing at compressor connector.
Client is going to have a complete new unit (not LG, I hasten to add!).
Now I've got to go to their shop and sort out an old Season unit.
Once again, thanks for your assistance.
Grahamen boca cerrada no entran moscas