Vaillant Turbomax 242/282 Problems Cont'd

hi, the tube has been replaced, the microswitch and valve are new the diverter valve is new, the heat exchanger is new(dhw) the pump seems to be working fine about the only thing i haven't changed are the sensors. haven't change the aps is it the circular item at the rear top of the boiler?
cheers
Andy
 

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