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Question DetailsAsked on 2/14/2016

upstairs bathroom has hot water but no cold water in the sink and the toilet tank is empty and doesnt flush

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2 Answers


There's probably a shutoff valve for the pipes that feed the cold water to the upstairs. May be located by the water heater,take a look around the house and garage. This is assuming the valves at the toilet and sink are open.


Answered 4 years ago by BayAreaAC


As BayAreaAC said, someone (family member, child, maybe neighbor if in a multi-unit building) probably shut off a valve on that line - most likely cause. Because you are getting hot water you evidently have water coming into the house still - confirm at another location like kitchen or outside faucet, and track down which water pipe(s) are affected by trying all water demand points.

Possible causes:

1) someone shut off a valve controlling that area because of a leak or to work on the pipes or to change a faucet or replace faucet washers or such

2) child turned off faucet to toilet and under sink while playing

3) if happened slowly, over weeks or months, and you have hard water could be a buildup in the cold pipe leading to that area gradually plugged itself off

4) rarely, if you have hard water with pipe buildup, a piece will come loose in the pipe and cause a blockage - normally only partial, not complete blockage

5) if unusually cold weather, that cold water pipe may have frozen solid

6) if your plumbing is goofy so only the cold water goes through a treatment device like water softener or osmotic filter or such, that could have failed or plugged up. About only time that is done is if the general water quality is OK for washing and such, but a person wants the cold water to be especially treated for drinking and cooking. Rare, but is done at times so the bulk of the bathing and clothes/dishwashing water bypasses the treatment process to reduce its cost or to increase water flow.

If you can't figure it out or can but can't fix yourself, Plumbing is your Search the List catedgory to get it traced and fixed.

Answered 4 years ago by LCD

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