After waiting a few hours, mostly spent warming up the bag of solution for manual exchange, the cycler started working again. Maybe the machine can’t stay on for too long after the cycle ends?
Baxter ended up calling/texting me at about 6pm Sunday night to arrange delivery. Even though the cycler started working again, I thought it was safer to replace the unit in case it falls again. The replacement cycler is also “pre-owned”. My PD nurse said these were old models; the newer model alarms too much for my nephrologist to recommend.