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Sounds like possibly a bad high water level sensor, or a bad drain valve. Both can be seen on page 5 of this manual.
When it hits high water level sensor, it should not send any voltage to the fill valve (easy to test) and send voltage to the drain valve.
No, if water level is too high, the drain would want to open.
Did the new cannister come with a new high water level sensor?
Another thing to check is the orifice in the fill water line. This may be missing or has become too large allowing too much water to flow in.
It should, you're right. Try pulling one of the leads off the fill valve as it's overfilling. If it still continues to fill, then it is a bad fill valve. Probably something stuck in there.
I understand, but if it's house water and no strainer or filter before valve, it's possible something got into the fill valve.
If you pull a lead off, the valve can't operate electrically so if it still fills, you know it's the valve.