I've not had the problem of no brine refill; with 1220+. It could be a 2310 valve stuck closed.
Otherwise a blocked injector and/or its screen or, a kinked drain line or blockage to/from the brine piston. Blocked DLFC in drain line elbow bottom.
Hell man, you ought to get a valve and tear it apart. I have had a couple women do it and I'm sure they're shorter than you are!
If it isn't the 2310 valve stuck up/closed. Shut off the water to the softener, open a faucet somewhere to relieve pressure, by pass it, holding a rag around the area, unscrew the injector area nut, you'll get a few tablespoons of water, clean the injector and screen and put it back together, put it in Service and turn the water on. Test fill and suction. It will take you maybe 8 minutes. Next time 3 minutes max.
I want pictures.
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