1. The MCB hasn't tripped, all other downstairs lights work, I know the dining room light is on the same MCB as I replaced the light fitting about 6 years ago. 2. The fitting is OK, (I have for the investigation swapped it for a pendant fitting I know works). 3. Lamps OK
Coming out of the ceiling there are only 3 wires, Red, Black and Earth, connected to a connector block. Both switches (one at either end of the dining room) are wired the same i.e. Black (No.1), Red (No. 2) and a further Red to Common, in one switch this Red is 'flagged' with white tape.. I cannot see these connections as being the problem, the lights have worked perfectly since the house was built in 1992.
4. Power is getting to the connector block (Red) at the ceiling, when either switch is used. 5. I have checked continuity between the connector block and the switches, using a 'bleep set'. Live OK, Earth OK, but I have *NO* continuity between the connector block and Neutral at either switch. 6. I have also tried continuity between the Neutral at the connector block and all 3 connections in both switches (one Black (No.1), one Red (No. 2), and another Red (Common), I have tried this with both switches turned on and off,
My (uneducated) feeling is that the Neutral connection has 'come adrift' somewhere, *SHOULD* I get continuity between the connector block and the switch(es)? Is my assumption correct if so how can I determine where from. My upstairs floor is made from those large chipboard sheets so it will be a major job to lift them so I would be grateful for any pointers in the right direction before I get the saw out!