hi all . I'v replaced the pcb in the above gas boiler about three weeks ago and now nothing at all is happening. i am a RGI but never worked on this boiler before. being on to mts arstion they advise replacing the pcb again. open to ideas. some times when you turn it on the standby light gives a glimmer of light for 1/2 second. the pump does not run and is not getting power