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Your DHW is heated indirectly in the plate heat ex (PHE) meaning the boiler fires up if a reasonable flow is detected when a hot tap is turned on, the hot water then produced by the boiler is diverted to flow through the PHE where the heat is instantly transfered (water to water) to the mains...

Modern boilers modulate meaning they adjust their heat output according to the systems demand, older boilers tended to be all or nothing, the burner indicator light might remain on but you can hear the fan speed slow down as it modulates to low flame. If you have a combi type boiler it can run...

Possibly your overheat stat, the i model doesn't have a diverter valve or plate heat exchanger like the CDi model.

It could be the nylon cam is not located correctly on the gas tap spindle, they can easily do this if someone is a bit heavy handed when rotating the control knob from the ignition to the ON position.

Changing the fan is a job for a RGI as its part of the flue, even removing the case requires you to be GS Registered as it forms part of the balanced compartment.

When the filling loop valve (in the centre) is opened it isolates the CW flow to the plate heat ex therefore no water flow at hot taps but a dribble of water would suggest a blockage in the CW inlet filter or a scaled up plate heat ex possibly caused by having the preheat turned on.