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Old 11-01-2011, 06:06 PM   #1
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Forced Hot Water Heat Wont Shut Off


I have a house that was built in the 1950. It has since been updated with forced hot water heat. The issue is, since the power went out for about 36hrs, and now that its back on, the heat in the bedroom (zone 2 of 2) will not kick off. We have an older turn style thermostat. Its at least 75 degrees in the room at all times, and the thermostat is turned down to 45 degrees. The rest of the house (zone 1) is normal. Any suggestions?

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Old 11-01-2011, 06:12 PM   #2
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Forced Hot Water Heat Wont Shut Off


remove the thermostat off the subbase...

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Old 11-01-2011, 06:25 PM   #3
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Forced Hot Water Heat Wont Shut Off


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remove the thermostat off the subbase...
..... and just replace it?
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Old 11-01-2011, 06:27 PM   #4
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Forced Hot Water Heat Wont Shut Off


no don't buy anything i just want to see if the zone shuts off.if it doesn't disconnect the wires
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Old 11-01-2011, 06:32 PM   #5
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no don't buy anything i just want to see if the zone shuts off.if it doesn't disconnect the wires
Took the thermostat completely off zone 2 and the circulation pump wont stop. Any ideas?

Last edited by Ice_Man; 11-01-2011 at 09:32 PM.
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Old 11-01-2011, 11:08 PM   #6
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Forced Hot Water Heat Wont Shut Off


It could be a short anywhere across your thermostat lines but
the most common cause is usually a motor in the zone valve that has died in the "on" position. If you take the cover off your good zone valve and have someone turn on the thermostat that controls it, you'll see how the zone valve motor will crank a lever over to push in a switch. Now look inside the zone valve on the problem section to see if the lever is pushing in it's own switch.
If you kill the power to the boiler and the lever on the problem zone valve doesn't release from the switch, then replace that 24V motor.

Remember to cup your hand under the zone valve to catch the little screw when you are unscrewing the motor. That little screw was designed to fall, disapear and add an extra half hour to a plumber's vocabulary.

Last edited by how; 11-01-2011 at 11:13 PM.
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Old 11-02-2011, 04:58 AM   #7
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Forced Hot Water Heat Wont Shut Off


the zone valve is stuck in the open position with the stat off the zone valve should close and the end switch opens up to shut the pump remove one wire going to the Normally Open contacts on the zone valve thee pump should shut of thru that relay package on the boiler

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