I have a mixer shower and the water runs intermittently completely cold for approx 10 seconds approx every 2 mins. No other taps in my apartment do this, but this is the only outlet controlled by a thermostatic valve. All my hot water comes from a combi boiler.
I have already tried changing the thermostatic value and this did not resolve the issue. I have done some tests and I have discovered my boiler goes off briefly just before the temperate drop, it doesn't do this for any other water outlet.
Any idea what the problem is and how I would fix it?