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Question DetailsAsked on 5/21/2015

there is a humming sound in my bathroom

flushed toilet turned the shower on and a humming noise started when I turned the shower off continued. turned the faucet on and off and still a humming. checked toilet to see if water was running and it was not. The toilet filled flushed and filled normally

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Listen with your ear to the faucets and toilet tank lid - also to baseboard or steam heating if you have that, though since you said started right after flushing/shower use, that would be quite a coincidence for a pump to start making noise at the same instance.


Could be a hot water circulating pump if you have constant-hot water system, a heat pump in a newer model water heater - but again the coincidence thing.


Most likely a slightly leaking valve, which could be leaking past the valve but still in the pipes (slightly on), or less likely leaking from the valve to free air. Should be very easy to tell by listening at the valves if shower or toilet. Also check toilet shutoff valve and sink faucet - it is remotely possible a valve seat just happened to start leaking at that time due to the change in pressure due to flushing - another coincidence but they do happen at times when parts are ready to start leaking.


Most likely cause by far - a toilet fill valve very slightly running because it is getting old so the valve seat is eroded or has a bit of grit caught in to. Try flushing a couple of times, if grit is in the seat may flush out. Otherwise, try holding the float up a bit more (gently) to see if that shuts it off with more float pressure. If so, adjust the float for a very slightly lower shutoff setting, which puts more pressure on the shutoff valve. Screw adjustment or bend rod on ball type float, adjust slide stop on valve lever arm for vertical-sliding canister type float. Also, if the vertical float canister type, rub down the shaft it rides on to remove any buildup of gunk that could be keeping it from rising all the way to shut fill valve completely off. Also, be sure the float is light - not full of water from a crack.


If the fill valve is the issue, if you have the type toilet (most are) where the last filling water flow is through a small diameter tube into the overflow riser pipe to fill the bowl back up after the flushing is done, a leaking valve will result in a drip or slight flow from that tube, which would be clearly visible with t he tank cover off. Bowl refill tube looks like this (red arrow in picture), and can flow a touch without causing any visible disturbance in the tank or bowl -


http://www.thisoldhouse.com/toh/photo...


If flushing a few times and adjusting float so it shuts off at a slightly lower float level does not work, then you need to replace the fill valve (decent DIY job if home-handy or you have a at least a slight comfort zone doing minor threaded plastic pipe assembly work) or have a Plumber do it - typically about $150 range labor plus $15-40 parts. I would use a kit that also replaces the flapper in the bottom of the tank at the same time while it is being done unless that is quite new so you don't have to go through the process again in a couple of years to replace the flapper, which typically lasts maybe 10-15 years in many cases.

Answered 4 years ago by LCD




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