You Advised:
so connect your voltmeter set on ACV to the terminals of the coil and switch the washer on You will see what voltage is applied to the terminals and can buy a contactor accordingly.
I did not perform this exactly as you suggest. I placed my black test lead on one of the two secondary coil wire from the transformer (this was a grounded wire). I then placed my red test lead on each side of the coil terminal of the contactor. My reading was approximately 30 ACV on each side of the contactor.
As important is that even though 30 ACV was passing through the coil of the contactor, the mechanical contactors did not connect. I am therefore a bit more convinced that the contactor is bad.
You Advised:
Don't worry too much about the contact ratings, this is a small contactor and they likely took what was available rather than designing to any particular requirement. Most likely any contactor you
can find will do just fine as long as the coil voltage is right.
I appreciate this advice. I plan to visit the scrap yard tomorrow and see if I can locate an discarded furnace with a three pole 24 volt coil contactor. Otherwise ebay has a few for less than ten dollars.
The contactor that I am replacing as L1, L2, L3 and NO (normally open).
The L3 contact is not used, but the NO has wires connected. I am assuming that the NO is just another contactor pole and that generic three pole contactor that does NOT have a NO pole will still work.
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