Both dhw and ch will run (after being reset) when the system is cold but then they begin to get a little flaky. Water will not run for more than a few minutes in dual mode if heating has been on. Nor will it run in water only mode if switched over. My daughter is waiting for a shower as I type this in and wife has spit the dummy out.
The central heating tends to run fine for a while from cold but is very unpredictable and can disable itself at any given moment
I have replaced the overheating sensor as a precaution in the hope that this was the problem but have not gottten any nearer to solving the problem.
The led indicates flame failure and any hope of it switching over automatically from hot water to c/h has long since evaporated.
is it likely to be the heat exchanger
The central heating tends to run fine for a while from cold but is very unpredictable and can disable itself at any given moment
I have replaced the overheating sensor as a precaution in the hope that this was the problem but have not gottten any nearer to solving the problem.
The led indicates flame failure and any hope of it switching over automatically from hot water to c/h has long since evaporated.
is it likely to be the heat exchanger