HOW DO I CHANGE THE BUILBS IN MY CHIMMEY COOKER HOOD

sounds like a welded relay...

You need to clean your chimney pronto.

Most major manufacturers supply manuals online so if you were to log on to the manufacturer's web site, you may be pleasantly surprised as usually, if available, one is able to download, by model number, Customer Instruction Manuals, Dealer Network for spare part supplies as required.

The information is normally free of charge.

I hope this helps.

you can try stove and acecceries on enternet.

Sounds like loose/burned wiring at the plug or spur unit .Check mains feed

Only by removing the rear outer panel of cooker, this will give you access to the element terminals..
If it is built in, then it will have to be removed from the housing.
Hope this helps.

That's the best solution.....

is the cooker hood vented outside?

indesit hi 591 cooker hood bulb blew replaced it hood not working at all now