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have a harvey whipple furnace that seems to be doing well, except over the last couple of days, no hot water upstairs. No water at all when I turn on the hot water tap in my kitchen and the upstairs bathroom. My husband bled the lines, still the same. He thinks there may be a clog somewhere? Any ideas what would make the hot water stop moving, but the heat is still on. It's oil, forced hot water. Started two days ago and I have no idea what's going on.