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Bad zone valve or aquastat
I can only get hot water if I jump the aquastat at the water tank. I replaced the zone valve because when I manually pushed the lever, my furnace kicked on (could have been by chance...I don't know). Also, the zone valve that I purchased had an open box so I'm thinking maybe the valve was used and not good. The only time I can get the furnace to kick on and get hot water, is if I jump the aquastat. As soon as I take the jumper off, The furnace kicks off. I have an L4006 honeywell aquastat. Thanks in advance!