Hi,i have lived in my house 17 years boiler was installed so no idea how old it is,but has served me well till now.We have a Randall 3060 timer and is only set for hot water only in summer months however it is now "locking out" after a few hours of firing up.This is rectified by pushing small button underneath the boiler unit (sorry dont know technical terms).Our system has to have a radiator left open at all times and this is heated when boiler fires up.Is there a easy fix,which is uncomplicated,loathe to spend much as is so old.Hope i have given adequate information to you.
Cheers
Paul
Cheers
Paul