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Honestly don't know. I've only found this out because I was told to pressurise the boiler and the valves have to be opened. Accidentally found that it all started working when valves were opened

Yeah everything is normal then when the valves are closed the temp decreases and water stops running from the hot tap. And then I get the error message on the boiler.

If the 2 taps are opened the boiler seems to work fine and hot water runs. See pic. I'm not to clued up on what they do

Boiler

Yeah there's power. If I restart the temp just goes down then cuts out with al06 on the display. Pressure is showing at just below 2 bar but has always needed to be above the recommended pressure to get going.

Everything was working fine until it happened. First thing I found when looking was that it was a pressure lock but switched the hoses round and water ran fine. Although I can't pressurise the boiler any more than it is. Not sure if it's related at all.

Would appreciate any help with this. I have no running water from any hot taps in my house. But have water from the cold. I have a sime combi boiler and this has also stopped working. Any ideas ? Thanks