I wonder whether you guys can help me. I have a Danfoss FP715 programmer that has suddenly stopped working. Both the LED status indicator lights do not come on whatever buttons I press. The rest of the display works normally except that there is what looks like a battery that is flashing next to the CH Status Indicator light. I have looked and there is a mention of a fuse how do i replace this and how do i check that the programmer is connected to the mains and working correctly.I have had the programmer for 9 years and have had no problems with it in the past.My Worcester boiler has power going through it but i am unable to get this to work due to the programmer not working correctly