Hello Graham,
The lenses unscrew anti-clockwise, but they can be very stiff and difficult to grip. The best advice I can give you is to double or triple wrap a thick elastic-band around the lens as this will give you much better grip than you will get on the glass alone.
If you are still unable to unscrew the lens, squirt a small amount of WD40 / penetrating fluid down the back of the lens so it runs onto the threads and leave it for 15-20 minutes then try again with the elastic-band grip. Once the lens moves a small amount it will unscrew relatively easily. The constant heating and cooling of the oven causes them to lock.
Please switch off the power supply to the oven before replacing the bulb and make sure you have clean hands when replacing the bulb - grease from your fingers can cause the bulb to fail or shorten its life considerably.
Hope this helps. If you are still unable to unscrew the lens, please let me know.
Regards,
BElectric.
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We have now obtained a tool designed to fit over the offending lamp from the Bosch service agent, Domestic and General. This has made the removal so much easier. Thanks for the previous suggestions.
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