Smeg FA166-5 - Manual (Page 22)

Instructions for the user
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8. EXTRAORDINARY MAINTENANCE
The oven may require extraordinary maintenance or replacement of parts
subject to wear such as seals, bulbs, and so on. The following
instructions describe how to carry out these minor maintenance
operations.
Before any intervention, disconnect the power supply of the device.
8.1 Replacement of light bulb
Remove the bulb protector A by turning anticlockwise and change bulb B
(in the 8-function model with front glass panel change the halogen bulb
C) with a similar one. Re-fit the bulb protector A.
Only use oven bulbs (T 300°C).