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November 6, 2009
Heating system not auto filling
I have a Weil-Mclain heating system. I just turned it on for the first time this season. It worked fine for a few hours but when I checked after 3 hours, the gauge glass was empty. The system was simply not refilling automatically. What could be wrong? I'm really heating system illiterate so please explain in non-jargon! Thanks.
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Post a picture of the boiler.
Posted by: IMBY at November 6, 2009 10:34 PM
You could have a bad low water cut off/water feeder or the boiler is surging (usually due to dirty water, sometimes due to incorrect piping) and pushing the water out as it runs and the pressure rises. If that were the case, the boiler would shut off and the water would return slowly.
Pic would help.
Posted by: Master Plvmber at November 7, 2009 6:34 AM
if your low water cutoff/ automatic water feed is a float type control, the float is probably stuck in the full position...flush out the water 3-4 times in rapid succession while rapping the side of the float sharply with the wooden handle of a hammer..that should free up the float...
it may also be that the switch has fused and needs to be replaced... if you have a probe typelwco, it needs to be cleaned or replaced
the bigger question is where is the water going?...is it leaking out of the return lines or pouring out of the main vents..you should have your system checked out by a heating pro, since it is ill advised to endlessly add water to a steam boiler..you are treating the symptoms, not addressing the underlying problem
Posted by: eman1234 at November 7, 2009 9:21 AM
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