I am new to this forum and I'm hoping someone can help me out with an issue I'm having.
I have recently installed a new bathroom in my house, this includes a new thermostatic mixer shower. The issue I have is that when I turn the shower on the combi boiler fires as it should and runs as it should, it will then go off and the shower will go cold, the boiler then fires up again and heats the water. I checked the status on the boiler when this happens and the 'flow' light goes out when the boiler cuts out so I assume there isnt enough flow going through the shower to keep the boiler fired?
So far I have checked the following:
Checked all isolation valves are fully opened.
Checked the filters in the shower inlets are clean.
Checked the hot water taps in the other rooms and all function properly.
I have also run the shower with the hot water tap in the bathroom sink opened as well and when doing this it functions ok.
Also the flow restrictor has been removed from the shower head.
This leads me to believe that the issue is there is somehow not enough hot water flow going through my shower? If I am correct is there anything I can do to fix this?