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Yes I am a tenant. Apparently I am not allowed to do any changes...

I only have one timeclock and the three port valve is on its side. Currently the time is set to be on between 5:00-8:00 and 20:00 to 24:00. In each room, I only have a TRV on each radiator. With the two knobs on boiler and one temp control on cylinder, that's all I've got in this flat. Or...

It is the former, I think...I just moved in a few days, so not quite sure...But they told us the water temp knob on the boiler is doing nothing. Both hot water and radiators are controlled by radiator temp knob. So I assume it is not a combi. On HW mode, the temp control on water cylinder was...

Do I need to change the control temperatures after changing to CH mode? It is 60'C on the water tank and 70'C on the boiler radiator control currently. All TRVs are fully opened.

It's a three port valve. It was HW mode. I have changed it to CH mode and switch the boiler off and on. Then it works as described.

It is a Valliant boiler. When the water is being heated, the radiator warms up and the boiler displays S.4 normally. And after a while, the boiler stops working and displays S.30 and the radiator cools. The thing is, the boiler won't start again even if the radiator has been cold completely for...

My boiler seems only start to work when the water in hot water tank needs to be heated. This results in the radiators only warm up when hot water has been used. This is inconvenient especially in midnight when I need the room to be warm but no one is using hot water. I have already switch the...