I had a hot water base board system. It did not automatically get water from the house water system. I would look to see if there is a pipe between you hot water holding tank and you home water system. There should be an on off value. See if you can tell if it is on or off.
If the systems are connected and you have a value turn it off (if it is on) and run your system for a few days. If you have to maybe open the windows and run it at 70 for the night. See what happens. I would not want to leave water in the house system and I would also not want to leave the home without heat.
Do a search for the operating manual for your boiler and if that does not work I would call the manufacture.
My thermostat can send me messages for various problems. See if yours can.
|