Hydronic baseboard heater not working (buzzing sound from utility room)

[paperpusher]

My basement bedroom hyronic heater have suddenly stopped working. The pipe is cold to the touch. It is on its own line.

Each time I turn on the bedroom's thermostat, I get a buzzing sound from some silver box in the utility room connected to the line feeding the basement heaters. Sorry, I do not know what that silver little box is called (its a honeywell) but it is the 4th one to the right in the photo. Thank you.

 

[Matt30]

Motor in the zone valve is toast. When your thermostat calls for heat, that valve opens allowing water to flow. Replace the whole assembly and purge zone of air.

 

[voletl]

Those zone valves have replaceable heads, so no need to cut out the old one. Remove the cover and look for 2 screws in the corners diagnal from each other.

 

[paperpusher]

Thank you guys for the help. Yes, the motor is toast now. Luckily there is a switch at the bottom for switching the valve to manual open. In the meantime this temporarily solved my problem as hot water is now actually flowing into the pipe. In the meantime I am placing an order online and should get the new valve in like a week. I will replace the motor and then put it back into "auto" mode.