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[HVAC] Problem with Baseboard Heat

We've been having a bit of a cold spell here in the mid-atlantic. I noticed that my baseboards aren't getting hot on my second floor. The system is two zones which operate on 1 thermostat zone one works fine and stays warm. Zone two sounds like it trying to come on (humming) but the inlets and returns aren't getting hot. I tried to purge the zone this morning and the inlet got hot however the return stayed cold and I only had a light but steady flow of water exiting the drain valve. Wondering if I have a frozen pipe or maybe a bad circulating pump? Any ideas/ suggestions btw I'm a new home owner so any help is greatly appreciated