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    halmar's Avatar
    halmar Posts: 5, Reputation: 1
    New Member
    		  
    #1

    Oct 15, 2009, 01:30 PM
    Circulating pump what else could it be
    The heat on the second floor of my home is blowing cold... its a 2 zone weil mclain hydro system... the st floor is hot... the second is cold what I have observed so far

    1. the boiler control unit has a light blinking... limit

    2. if I touch the pipe just below the circulating pump its very hot... just above the pump is warm... as I move away from the boiler a few feet the pipe is cold


    Any ideas?. I took the liberty of putting a new circulating pump just in case... but didn't fix the problem
    hvac1000's Avatar
    hvac1000 Posts: 14,540, Reputation: 435
    Heating & Air Conditioning Expert
    		  
    #2

    Oct 15, 2009, 02:30 PM
    Low system water pressure is the place to look first. You need about 12 pounds for a 2 story.
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