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How many zones/thermostats do you have? is the motorized vent damper open? is the pump running?
I'm sorry but Facetime is not an option. I can call you but it's an additional charge. If you want a call then select that option. But we can continue here if you like. The motorized vent damper (see attached pic for typical)is on the flue/exhaust vent. The motor has a flat shaft. If the flats are horizontal the damper is closed, if the flats are vertical the damper is open.
You can check if the pump is running by putting the handle of a screwdriver to your ear and the tip on the pump. If it's running you'll hear it spinning. 1 thermostat = 1 zone
I didn't say to " turn the damper on" I asked if it was open. Thanks for the pic of the feed valve but it's not related to this issue. Can you give me some pics of the boiler and the boiler controls?
Any other control boxes (probably gray)? Please remove the cover on the gray control box on the front of the boiler and give me a well focused shot of the inside.