Cant seem to find one online anywhere!?? plenty of Baxi Manuals available but not for this model. When the Thermostat Kicks in the boiler makes a loud 'Stun Gun' Type sound, its not a bassy sound but i can hear it upstairs from the other side of the house at night - Driving me mad! - Trying to get to the bottom of this. Can anyone help?

James, March 2009