At the bottom of the pump stem, there's a flat washer that should move freely (it tends to get gunked up with usage). I used a small flat-bladed screwdriver to carefully pry it up a bit all around, and then sprayed it with WD-40 and manually rotated it to free it up. To get rid of the WD-40, run a few brew cycles with just water. Here's what the pump stem looks like:
If you're lucky, that'll fix the problem you're having. If not, it may be the thermostat. In my case, one of the thermostat connectors had corroded and slightly loosened.
I removed the connector (CAREFULLY) and lightly sanded the terminal it was attached to. Reattached, reassembled and the percolator is now working fine. If I have the problem again, I think I'll simply bypass the thermostat completely (it's probably ready to fail anyway--the terminal felt loose, and I noticed a few small particles of ceramic plastic--chances are the thermostat housing is crumbling due to high temperature). This will disable the "keep warm" feature, but since I've got the 2-4 cup model, I won't really miss it (I usually make only enough for an extra-large mug). Once the coffee is brewed, I'll just unplug it.
×