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Posted by Mike Hinz on June 04, 2006 at 23:53:57:
In Reply to: Re: High Boiler readings posted by Joe Lambert on May 25, 2006 at 08:47:25:
We've had this problem, and found in our case that it was caused by the automatic valve becoming plugged, and not blowing nearly the volume of water we thought it was.
When closed, sediment built up against the valve.
I agree that a water softener would be a good idea--as it is on any boiler.