When we turn on the hot water tap, about 10 seconds later, we get hot water - which is great!. However, if the tap is kept running for a further 10-15 seconds, then the water actually turns cold and takes about 5 or 6 minutes to come back to temperature.
The drop in temperature coincides with the firing of the burner, i.e. the water is hot until shortly after the burner fires.
Also, this only happens after the boiler is left for more than 1/2 hour or so.
Engineer has replaced both flow switch and heat store stats but that hasn't resolved the problem. Rather than continuing to pay for parts to be replaced without the problem being solved, I was wondering if anyone could suggest what the problem/solution might be.
Thanks in advance.
The drop in temperature coincides with the firing of the burner, i.e. the water is hot until shortly after the burner fires.
Also, this only happens after the boiler is left for more than 1/2 hour or so.
Engineer has replaced both flow switch and heat store stats but that hasn't resolved the problem. Rather than continuing to pay for parts to be replaced without the problem being solved, I was wondering if anyone could suggest what the problem/solution might be.
Thanks in advance.