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Try bleeding the system TC, as the noise may be due to an air lock.
It could also be why it is shutting down.
If you don't know how to ( but I reckon being TC you do) :---
Using a radiator key, go round each of the rads,working back from the nearest to the boiler ,with the boiler and pump going.
Turn the key anti clockwise slowly, with a towel close up to it. You will hear a hiss prior to the water coming out . Close it after a couple of seconds of the water flowing out. C'/Ht'g systems should be bled once a year anyway.
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