Our loft toilet is running intermittently. The slightly odd part is that it seems to be occasionally triggered by the 1st floor bathroom water use. Why would this be?
Your fill valve is scaled up or the washer has perished and doesn't seal properly sometimes. Changes in pressure jiggle it. I'd swap it for a new one.
@GoatandTricycle started
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Our loft toilet is running intermittently. The slightly odd part is that it seems to be occasionally triggered by the 1st floor bathroom water use.
Why would this be?