I have just installed a new bathroom ceiling light, the old one was a standard fitting with a 100w bulb, the new light contains two flourescent T5 tubes at 22 and 40 watt. The light switches on fine but after app. 5-10 minutes goes off without operating the pull cord. Once off it does not immidiately go on again. New light model is FLOS Button (large).

C Graf, January 2009

Just for clarification. Light switch? in this case - is this the pull cord? Although, the previous fitting and bulb was working fine.

C Graf, January 2009

Replace the light switch. The switch contacts are heating up because they are burnt and pitted. After a while they get hot enough to cause the contacts to separate.
This is a 'MUST DO' job. Also check the wiring within the switch for heat damaged insulation.

cledlyn, January 2009