One of my baseboard radiators does not work, but others work fine in the hot water heating system. Does anybody know why?

Helen, if it is the radiator in your car that was changed, you may have air in the cooling system that needs bled out. May also be a failing water pump, thermostat,etc.
Check the attached links,instruction and guides, Good luck
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How To Bleed Cooling System EricTheCarGuy
Bleeding Air In Cooling System
How to Bleed Air From Your Cooling System DoItYourself com

Check your thermostats settings and make sure the circulating pump is turning on.

Turn off water but leave heat on - Possible? - Handyman WIRE ...

handymanwire.com > ... > Heating and Air Conditioning

Jan 14, 2003 - 10 posts
My hot water baseboard heating system is a closed system. ... Could I shut off the main water and leave the boiler and heat going for ... If one is not installed, install one and rely on that to save the boiler from the damage of running out of ... I do not wantto have city water push my antifreeze out of the system ...

What's the best temperature to set my hot water baseboard ...

greenhomeguide.com/.../whats-the-best-temperature-to-set-my-hot-water...

Nov 21, 2010 - With hot water baseboard heating, is it better to keep the heat at 60+ degrees ... a hot water heating system where water is heated in a hot water boiler and then ... by setting the thermostat to lower the heat when you don't need it on. ... Not only do I turn my heat down when I leave for work in the am but also ...

Did you bleed the air from the pump .

The answer to your question depends on the design of your heating system. There are two common piping arrangements. The first is called a Venturi system. In this type of system you have a main loop that runs around the house with "scoop" tee's that force the water through each radiator/baseboard in the loop. With this type of system you must bleed each radiator individually. At the end of each radiator you should find a bleeder that will require either a flat head screwdriver or a square "key" (available at the big box hardware stores) to open the valve and bleed. This can be a somewhat time consuming process as to do it correctly you must go around the entire loop (preferably in the order of flow) 3 or 4 times to ensure you have moved all the air out of the system.

The next type of arrangement is know as a standard loop. This is where the water flows from one baseboard to the next, in a loop. (ie the baseboards are connected to each other, not just pulled off a common loop). In this type of a system you should find a "stop and purge" set up at the boiler. There should be a valve on the return close to the boiler, and just above that a boiler drain. (faucet type fixture). If you close this valve, connect a hose to the boiler drain and let the water flow into a bucket, you will be bleeding the hot water loop. If you have more than one zone, you will want to close all the valves at the return, and bleed each zone out indiviadually. After all zones have been bled, you can then re-open the valves.

As a note, you should see a water feeder located on the piping going into the boiler. (This device is connected to the cold water line that feeds all your household fixtures. ie sink, tub, etc) If you move the lever to the fast fill position it will allow water to flow into the boiler at a much faster rate, thus helping you push the air out easier. This is only really possible with the Standard Loop layout, because you need to monitor the boiler pressure anytime it is "fast filling". If you are "fast filling" you MUST ensure to release the lever prior to closing the boiler drains or you run the risk of causing the pressure relief valve to open, which can and will cause personal injury and property damage.

Hope this helps

Hi,
If you have baseboard heat the only way to raise the humidity is to get your self a separate humidifer and run it separately from the heating system...there is nothing in a hot water heat system that will do anything for the humidity levels...

heatman101

Okay couple questions here because either you have hot water baseboards or you have electric baseboard heaters.
- if the system is a hydronic baseboard heater fed form main boiler, usually this means your space heat is controlled by a zone valve which the zone valve is controlled by your thermostat.
-if you find the zone is controlled by a zone valve than it is possible the zone valve is defective causing hot water to bleed past the zone valve even though your t-stat is telling it to close.
- first find out what excatly the baseboard is heated by either water or electricity
-next personal message me and I can walk you through it

What is it that you are trying to do? Do you have a piece of hot water baseboard heater and you want to 'power' it with an electric hot water heater?

Codes aside, I don't see why it would not work. You will have to put a circulator (and a temp control device) on it to move the water.

This is not going to be a very economical heating system.

if your boiler is a combi re-pressurise locate filling loop and refere to manual