Toilet makes high pitch whine after flushing, but only in the middle of the night

Question

Sometimes, when my toilet is flushed in the middle of the night, it will make a high pitched whining noise for several (5-10 seconds) while refilling. This doesn't happen during the day, and it only occurs sporadically in the middle of the night.

Can this be caused by higher water pressure during the middle of the night?

Could the temperature of the water be the culprit? It is mid-April right now, and the daily temps are just starting to get higher (like in the 70s).

I have attempted searches on the internet, and most point to the refill valve or ballcock assembly having issues, but since this only happens sporadically, and in the middle of the night, I am wondering if it could be some cause outside of the toilet.

Owain · Answer

In many areas water pressure is lower at night, to reduce leaks on the network. This will slow filling, and the valve might be 'dithering' at an awkward point, whereas under higher pressure it fills quickly enough to move over the awkward point quickly.

Toilet makes high pitch whine after flushing, but only in the middle of the night

One Answer

Add your own answers!

Ask a Question