Microwaves are incredibly convenient appliances. You put in your food, press a couple of buttons, and in a couple of minutes, your food is piping hot and ready to eat. But what can you do if your LG microwave isn’t heating?
A microwave that won’t heat is pretty much useless, but before you throw in the towel and buy a new appliance, consider these solutions. Our step-by-step instructions walk you through how to fix some common causes of an LG microwave not heating. With a bit of effort, your microwave can be up and running again in no time.
This guide refers to all popular models of LG microwaves, including:
863.5939
ACO1860AS
EM1204S
EM120S
EM3321S
LCRT2010ST
LMH2016ST
LMHM2017ST
LMV1630ST
LMV1680BB
LMV1680ST
LMV1680WW
LMV1683ST
LMV1813ST
LMV2031ST
LMVM2055ST
MA1005W
MA1272MW
MBBS/01
MMV4205AAW
MMV5156AAS
This may sound obvious, but if your microwave is set to one of the lower settings, it won’t heat your food effectively. Check that your LG microwave is set to the highest setting, then try heating your food again to see if the issue is fixed.
Make sure that the outlet your microwave is plugged into is working properly. If you’re unsure, unplug the microwave and plug another household appliance into it, such as a lamp or speaker. If the other item works correctly, you can rule out a power supply issue.
If the other appliance doesn’t work, the circuit breaker that corresponds to your LG microwave has likely been tripped. Here’s how to fix it:
If your microwave has experienced a power surge or other electrical fault, this kind of event can prevent it from heating. Here’s how to reset your microwave and hopefully fix the problem:
For safety reasons, a microwave won’t run unless the door is completely closed. Make sure it’s properly closing, and check to make sure there isn’t anything blocking the latch.
If your LG microwave is brand new, there might be a shipping spacer still positioned in the door. Make sure to remove this and any other packaging before trying to operate your microwave. If there’s nothing blocking it but the latch still isn’t working, it will need to be replaced.
How to replace the door latch:
While the previous four solutions are fine for a layperson to perform, the following issues require someone who is a certified technician, due to safety issues. Microwaves have a unique feature in that the capacitor stores a huge amount of power even when the microwave is unplugged—enough to cause electric shock or even death. Please don’t attempt the fixes below unless you are qualified.
A microwave’s diode powers the magnetron so it can heat the food. If the diode is burned out, your food won’t be able to heat.
To replace the diode:
The magnetron works with the diode to produce microwave frequencies to heat food. If the diode appears fine, the magnetron may be to blame.
To replace the magnetron:
The thermal fuse protects your microwave from power surges and overheating. If your thermal fuse has blown, your LG microwave won’t heat your food—in fact, it won’t run at all.
To replace the thermal fuse:
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