I have an issue with my baseboard heat staying on a steady 70 degrees with the thermostat off. I replaced my flow check valves in all 3 zones thinking they may have been corroded (hard water), changed out the Honeywell Round thermostat in the bedroom where the issue lies and installed a new round Tstat.
Now I'm thinking it must be a relay or circulator pump issue. I can't seem to figure it out considering I have 3 zones, but only 2 relays and 2 Taco circulators.
What seems to be the problem? Any help would be appreciated.