radiator

Air in the system.

Turn the Central heating off, vent (bleed) all the radiators upstairs.

Check the pressure of the system hasn't dropped below 1 bar, if it has top it up (if its a pressureised system).

Turn the central heating on again.
 
You need EAS :idea: Enhanced Aural Sense - (Not *ral *ex :oops:) to Hear the noise :idea: X ray vis. is old hat nowadays.
 

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