Question about LG LMV1630ST Microwave Oven

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LG 1630 st is not heating!

Not heating when on..........brand new microwave bought 4 days ago and worked fine for 3 days. Does anyone know what the problem could be? I spent 2 hrs installing it over the range

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  • Anonymous Mar 30, 2008

    Ive got the exact issue I guees all we can do is call for service

  • Kaixo Apr 08, 2008

    I have the same problem Everything works but i won't heat, I have the lmv-1630st otr manufactured February 2006.

  • Anonymous Jun 02, 2008

    Our new LG Microwave LMV1680St worked fine for 4 days and then would not heat anymore.Everything else is working,the clock,the inside light.exhaust fan turn table are all working. Taking it back to Best Buy today June 2, 2008

  • bigbugman Oct 14, 2008

    Have exact model for one week and has done the same thing. Everthing

    works except will not heat. Very frustrating. Any help?

  • 475895 Oct 26, 2008

    Have the same problem - lg 1630 just 4-5 months old and everything works except its not heating! Manf Date Dec 2007. Any solutions yet?

  • Anonymous Nov 15, 2008

    Same for me... I was able to exchange it for another microwave and am back in the same boat.

  • Anonymous Apr 23, 2009

    We've had our microwave for just over a year (past warranty date, unfortunately) and tonight the exact same problem occurred.  Turns on, lights go on as if it's cooking, but nothing heats up.  It sounds like some sort of fan is going off (maybe the vent?), which doesn't normally happen when it's working properly.

    I've emailed LG but don't expect to hear back.  This is really frustrating b/c it took so damn long to install over the range! 

    Wondering if the cost of a repairman outweighs the $200+ we spent on it new.

    Any thoughts?



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I have the same problem and mine was manfuactured Feb 06. HMMMMM. Very interesting. I am going to E-mail LG. Anyone else have the manufacure date. The date on the inside to the left of the door frame

Posted on Aug 25, 2008

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Same issues here, power up as usual, everything works except it doesn't heat. Usually when the magnetron kicks in, you know it because the unit bogs down from the load, well no bogging here just steady running of the fan. (Manufactured in 2007), do I detect a class action lawsuit in the works? I was fortunate enough to have purchased the extended warranty.

Repair man showed up day one with the most likely culprits (Magnetron & Diode), replaced them both and no help, there goes thanksgiving.

2 1/2 weeks later the tech showed up with a couple of (Micro Switches and a Thermostat), replaced those, ho help.

Now he suspects it the (PWB/PCB Power Control Board), because there isn't any power coming from the board to the tell the huge transformer to power up and sent the required voltage to the magnetron.
We will see when that is replaced if I'm back in business.

Just an FYI folks, if you're going to tinker with this use EXTREME CAUTION, as the transformer could put out upwards in the range of 4,000 volts, not to mention what the mag can do to you, so be SMART and be CAREFUL.

Posted on Dec 15, 2009

  • CaptainGumbs Dec 16, 2009

    Third time is a charm, the tech replaced the (PWB/PBC) today and we have a winner. That was the problem, either the Power Control Board itself or one of the relays on the board. Replacement was free because it was under extended warranty, but still reasonably affordable at repairclinic dot com ringing in at about $60. So good luck.



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