Over the last month I've noticed that the bath tap in the upstairs bathroom will go stone cold every couple of minutes for about 30 seconds. The only way to get hot back out is to turn the cold off and the hot to maximum and then after about 30 seconds it goes back hot again. It doesn't seem to do this out of the downstairs taps.
The boiler is downstairs and about 8 years old.
The boiler is downstairs and about 8 years old.