Question about Washing Machines
An MOV is a "metal oxide varistor". This is a very common heart of a surge suppressor, which can be used "across the line wires" to prevent harmful voltage spikes from adversely affecting equipment. Most of the time however, an MOV will sit idle in a circuit for years, then one day, it gives its life blocking a voltage spike. You use the equipment the next day like nothing happened. Everything works fine - until the next voltage spike.
Your MOV has already activated, and is no longer able to provide the protection it once had. As a result, the next voltage spike passes unobstructed by the failed MOV into the circuit ruining the circuit.
The problem is that the MOV never told you it failed. Many times, a number of MOVs are installed all at once - each one fails at each subsequent voltage spike. It could take years, decades or more before the last MOV fails - likely long after the warranty is over.
You can probably see that the failed 50 cent MOV isn't the problem any more. It was *before* the circuit failed, but you never knew it had failed. Now, the latest voltage spike fried the circuit and it will require wholesale circuit board replacement or labor intensive troubleshooting to locate and replace all the failed parts on the circuit board.
You're better off buying a used board or an entire used machine until you can fix this one.
I hope this helped you understand about MOVs, and that replacing this part will not restore the machine to working order.
Posted on Sep 09, 2010
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Posted on Jan 02, 2017
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