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Where is boiler stat on this model, just put boiler on and is running ok but I know it will happen again tommorow, did put a tube of fernox super restorer in yesterday

Boiler starts up no problem for CH, radiators get warm, after a few mins boiler starts knocking and banging, undid screw on front of pump to check running but found pump had stopped (impeller spins freely), switch boiler off to let cool down for maybe 20mins, and boiler starts again no problem...

When boiler starts for heating it runs for 30 seconds then stops and starts again, this goes on for about 20 times then settles down and keeps running. Also when hot water is used, heating wont start again for a good 15 mins. Boiler has been descaled recently but problem still there??