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Hello, so far it sounds like some of the pipe circuits are air locked and need to be vented or a wide range of other problems.
I need a photo of the piping board and valves taken so I can see all of the piping at the board and where each one goes.
Click here please, tell me if this is the manual for your boiler or not.
See error codes starting on page 6 tell me if any of these are showing up or if your boiler is an older model with such error code display capabilities,
We can go from there.
Good work, I am glad the manual page 21 helped.
The domestic hot water should run between 125 and 130F, 196F is completely dangerous (its scalding hot).
Put a thermometer under one of the hot taps to measure the actual water temperature delivered... it should be in the 125-130F range. 140F maximum.
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We can go from there without a time limit.