Fix Fault Alpha Boiler

My boiler seams to be starting and stopping on its own, does not seem to be sinking with my thermostat,

My boiler isn't producing hot water or heat and is saying error code 20 - which is saying a flame sensing fault, Any ideas on how to fix it or if I need someone to come look at it

When I turned on my boiler the temperature goes down and it made a gushing noise it keeps coming up with E60 what does this mean

My boiler won't respond when I am trying to turn it down I've tried everything I know not the batteries tried resetting it I have to keep putting it on summer mode help