I can turn the cold water tap on but no cold water actually comes out. There are no groaning or knocking sounds coming from the pipes so I'm not sure what's going on... any ideas or should I call in the plumber straight away? I'm getting pretty sick of waking up to a scalding hot shower every day.
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If you have the new ceramic tapware, skip this reply, but if you have the older style tapware, it could be a sticky tap washer.
I've had it happen a couple of times, & as yours is the cold water tap, you're in luck.
Simply turn off the water at your meter, remove the tap handle & body of your shower tap to expose the washer. With the plastic bodied washer fitting, the spindle can bend if someone's turned the tap off too hard. The brass bodied tap washer ones can get calcium build up on the spindle which can cause them to stick.
Replace the washer if needed, but be careful that you open the valve at the meter slowly to prevent water hammer.
Hope this helps.