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Three of four zones, baseboard heat, warm house, why not fourth

Just the other day the upper floor zone baseboard heaters stopped working and that floor is not at about 60 degees F. I replaced the zone valve in case that was the problem however the pipes for that zone remain cool while all of the others are very hot.

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Go to the last heater in the zone and look for a bleed off valve so you can get the air out of the system. you may have to bleed it off several times as the air works itself thru the system. usually there is a automatic air vent on the very highest point that the system has. Let me know if this helps and have a Merry Christmas

Posted on Dec 23, 2008

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We have radiant floor heating system ran with /wirsbo valves. One zone is not working..not heating at all. The valve seems to open up when thermostat is turned on but not heating room. Any suggestions?


Are you able to isolate the Zone?
If you are able to isolate the Zone, is there anyway you can bleed air out of the system?

1) turn off the other zones and see if this one starts to heat up,
if not. Try to bleed Air out of the main header until it gets warm. If this does not work, do you have to manually add water or is it an auto fill system? Make sure that is working or manually add water.

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I have a two zone water baseboard system... I installed a new zone valve to the upper zone which was not calling for heat.. the only heat it got was when the lower zone was circulating... Now the upper...


Good clues to work with--
Let's review how you wired up the Zone Valves, in relation to the Boiler Control panel...

You say the upper zone does NOT SHUT DOWN--
Does that mean it is OPEN ALL THE TIME?-- (even when the circulating pump is OFF? )
That sounds like the thermostat is not even in the circuit, then.

Have you been able to cycle each of the valves thru their cycles-- Open- and then closed?
-- It almost sounds like you have an interconnection between the two valves-- is this possible?

Each Thermostat has to control its valve only...
and most systems do this thru a control panel at the boiler--
So-- How is your control panel connected to the 2 thermostats, and how are the 2 zone valves connected to the Control board?

Are you following a wiring schematic for hooking the valves and thermostats to the control board?
There should be a schematic with the new valve you must installed, right?
did you wire it like the instructions showed?

Make a few more tests, and get back with us--

Mack B

Jan 18, 2011 | Heating & Cooling

1 Answer

I have a Weil-McLain hot water boiler for baseboard heat. The system has one circulator pump. The system has 5 zones - 3 work fine and two are not working. All the zone valves and thermostats are...


Hello.Prob#1 valve has a bad END SWITCH,change the power head,thad brings the circ on when open.Prob#2 try manual overide lever.iS IT TIGHT OR SMOOTH?DOES IT JUMP/SNAP?motor very hot? all bad signs.Change that power head too.The transformers are OK because 1 trans can only run 3 valves max.

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1 Answer

The Zone 1 (basement) and Zone 3 (second floor; no


On the zone damper motor, there should be a little lever allowing you to open the damper for emergency heat. Probably a bad zone motor or connection.

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1 Answer

Furnace firing. Plenty of hot water. No heat.


Most Boiler and zone controlled systems I can remember working on with up to 8 or so zones, the Bell&Gossett circulating supply pumps or pump ran all of the time to keep the upstairs baseboards warm.If you have a relay that controls the pump, see if you can bypass it and if it comes on, replace it. Be sure all of the coils on the zone valves are energized and opening, if it is set up that way.Get back to me and let me know.
Sincerely, Shastalaker7

Nov 06, 2009 | Heating & Cooling

1 Answer

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i would check my water pressure on boiler sounds like lack of pressure or air in system they can be related. if you have bleeder on baseboard try to bleed.

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Thermostat temperatures not reaching preset Energy Star settings


Well with a boiler system like you have it will cost you more money to heat your house that way than if you leave it like it is. With a boiler system it takes a lot longer to heat an area than with a furnace. The best thing you can do is find a happy medium and leave it there at all times. If you read the paper work on your new thermostats they have a set procedure which tells the thermostat if you have forced air or boiler system. Do you have baseboard or in-floor heat how many zones do you have.

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It is not your thermostat, it is an airbound zone. The gurgly noise you heard was that water and air flowing through the radiator. The zone needs to be purged either at the boiler, or through vents on the radiator. Hope this helps

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try to get one that is made for oil heat, the installation is easy only two wires, and the instructions make it easy.

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It is possible the relay on the zone board is bad, You can test the thermostat if you own a voltage meter. It is possible for the thermostat to display and still be bad.

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