[FONT="]When you winterized last year, I'm betting that you only poured antifreeze into the bowl...that you didn't disconnect the intake line from the thru-hull, put it the jug of antifreeze and pump antifreeze through the entire intake and pump.
If you simply pour anti-freeze into the toilet bowl and pump the toilet a few times, you've protected the discharge side of the toilet but not the intake side of the toilet. In the front of the toilet's pump, under the selector knob for dry or wet flush is a spring-loaded rubber ball--a check valve that controls the incoming rinse water to the toilet. A little water stays in this area all the time. If you don't replace this water with anti-freeze by pumping the anti-freeze through the entire pump from the intake through-hull, that water will freeze...and when it freezes it doesn't crack the plastic housing or break anything, but instead it forces the rubber ball down into the water passage immediately beneath it, completely sealing off the passage. Once this happens, you can't pump the pump or bring in any outside water. The inlet valve then has to be disassembled and the rubber ball then must be driven out with a hammer and dowel. It's a real pain in the butt, plus you usually chew up the ball in the process of getting it out, so you might as well order replacement before you take anything apart.
Usually, the pump refuses to go down...but in your case, it went down and refuses to come back up. Most likely that means there'was a little leakage past the piston "O" ring...which means you'll have to disassemble the pump to find out fix it. In which case, you'd prob'ly be well advised to put a rebuild kit in it. If the toilet is was made after 6/92, the correct kit is PHIIRKC.
The PHII is an excellent toilet...consistently rated the best manual toilet under $500 for a couple of decades. Once you've got it working again and learn how to operate and maintain it, it should give you 20 years of reliable trouble-free service. You can download and print the manual for it from here: [/FONT]
Raritan PH II
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But you also need to USE it! Machinery, whether mechanical or electric, is the same as people: it needs exercise. Without it, equipment deteriorates MUCH faster than it does with continuous heavy use.[/FONT]
Having the ability to flush the head via the head sink is really convenient, especially when it comes to winterizing the system.