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Question DetailsAsked on 3/27/2017

Just installed new bathroom. Now only cold water from hot faucets all over house. HW tank is working ok.

I can isolate hot water from tank to deep sink so I know the tank is working. No cross plumbing. Cold water comes out of Hot faucet in kitchen, bathroom and new bathroom. All worked fine before new sink put in. Ran all faucets to try and bleed air. No blockage. Could there still be air in line?

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2 Answers


Hmmmm - even if there was a cross-connection in the sink, I would think it would be warm, not cold at the hot lines. Turn off the shutoff valves under the new sink and test elsewhere to see if that solves the problem - if so, you have a cross-connection in the sink plumbing (hard to achieve that one) or the hot and cold in the faucet are combined internally in the faucet - maybe missing a sealing washer or such - this can happen with single-handle faucets if one of the sealing washers is missing or missing its spring, for instance.

Other thought - you said NEW bathroom - if a toilet mixing/tempering valve was put in and is missing the valves in it (maybe not put back together after soldering it in) or was soldered without removing them so the internal tempering valve is stuck due to melted washer or seat, could blend hot and cold water, possibly causing it to pull from cold line when hot water is demanded. Or possibly, depending on design and how it was plumbed, if it was put in backwards, could be blocking any hot flow and allowing cold water through.

Another tempering valve possibility - if he went very old-school (like pre-80's or so) or skimped and saved $30-80 in parts by just connecting hot to cold lines in a Y or T at the toilet water line, could be short-circuiting there.

Otherwise, somewhere the hot line got cut and reconnected to the cold lines in the course of the bathroom remodel. Or there is a cross-connection AND a hot line shutoff valve got left closed.

Either way, assuming this cropped up right after the remodel, sound lihe the contractor's problem to track down and fix. If a DIY job, start running hot water in faucets and track along the lines with your hands or an infrared thermometer (if you have one) and see where the hot water lines change from being hot/warm to cold.

Answered 3 years ago by LCD



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Answered 3 years ago by Member Services

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