how can I resolve this problem?

micon 60ff fitted myself about 7years ago. It started with fan running only so changed the pcb and safety temp limiter.Now it fires up then off then fires again and runs ok,Sometimes perhaps 3times aday youcheck and it's off, theburner light is flashing and the reset light is on, if I now switch the temp control off then on,it fires up twice and runs.any idea?