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Old 12-01-2011, 06:49 PM   #1
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heat wont stay on!


I have an oil burner, hot water pipes that has 4 zones. The 2 zones in the lower level work and the 2 zones on the main level dont.
The circulators make funny noises. My husband bleeds the lines and the heat, comes up, but will not stay on...
Thoughts PLEASE!


Last edited by cyndimckenna; 12-01-2011 at 06:50 PM. Reason: typo
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Old 12-01-2011, 07:02 PM   #2
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heat wont stay on!


he can't bleed the lines with the system running the circulator need to be off let the water cold feed pressurize as he bleeds all the vents....then restat the system.the reason the boiler isn't heating is your circulator is trying to move air then water then air...and the limit is met and shuts off becuase the boiler water is heated up but no moving out....into the home

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Old 12-01-2011, 07:38 PM   #3
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heat wont stay on!


Another possibility is the pump/impeller is dying. (funny noices?) The pump hasn't enough ommph to circulate the water in the upstairs zone but bleeding the upstairs radiaters temperarily pulls some hot water up into the upper zones. Lack of mechanical circulation causes the boiler to limit out. Bleeding the rads also brings in replacement cold water into the boiler which cools the overheating aquastat so that the boiler refires for a couple of minutes.

Biggles possibility is the post to first pay attention to because his solution is easy & free. If it doesn't sort out the problem though....
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Old 12-01-2011, 08:47 PM   #4
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heat wont stay on!


Thank you, we have not found any bleed points on any of the pipes. He does have the circulator off when he bleeds it. One of the circulators was replaced, what is the likelihood that both are bad at the same time? Air seems to continue to get into the line. The only bleed that we seem to have is at the boiler.
How would air get into the pipes? Sorry, don't know too much about how they work....just like it when they do!!!!
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Old 12-01-2011, 08:49 PM   #5
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heat wont stay on!


oh, and the circulators make funny noises if we have the thermostat up, when it is off and not calling for heat, they are quiet. It is getting cold enough to try on its own now.
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Old 12-01-2011, 10:15 PM   #6
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heat wont stay on!


should have an Expansion tank on the suply hot out of the boiler...if the guy chaged the circ pump and didn't bleed air out that might be a source...air can't get in unless the piping system is opened.....any chance of draining the X tank
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Old 12-01-2011, 10:40 PM   #7
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heat wont stay on!


When was one of the circulaters replaced? Did the problems occur immediately after that replacement? I am wondering if any of the gate valves that were turned off for the pump change were not turned fully back on.

Some pictures would help in seeing what type of expansion tank you have, as a possible source of the continuing air in your system.

I think you should also consider fully turning off the water supply to your boiler as a test to see if the water pressure on your guage starts dropping and by how much?
Another possible source of the air is that its coming in within the new water that is replacing the hot water that your relief valve is probably dumping. Feel if the 3/4" draining vent line from the relief vave is hot.
Feel the temp of the this drain line at least 4 feet away from the relief valve.


Last edited by how; 12-01-2011 at 10:49 PM.
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