What do the symbols on my oven dial mean?

Oven symbols look like a code you have to memorise per brand. They are not: they are a near-universal convention in which the square is the cavity seen from the front and each mark inside it is one heat source. Once you read them as a wiring diagram rather than as icons, an unfamiliar oven becomes readable in about ten seconds.

Step by step

1. Read the square as the oven seen from the front.Top of the square is the roof of the cavity, bottom is the floor, middle is the back wall where the fan sits. Every mark is in the position of the thing it represents.
2. A line across the top is the top element.A full-width line is the full grill; a shortened line in the centre is the half or inner grill, which lights only the middle of the element for one or two portions. Both are radiant heat from above only.
3. A line across the bottom is the base element.On its own it is base heat, used to finish an underdone pastry base or to keep something warm. It is rarely the setting for a whole cook.
4. Lines top and bottom with nothing in the middle is conventional.Both elements, no fan. This is what a recipe written before fan ovens assumes, and it is what a recipe means when it gives a temperature with no fan note.
5. A fan inside a circle is true fan.The circle is the ring element wrapped around the fan at the back. It is doing the heating; the top and bottom elements are off. This is the setting that needs about 20°C off a conventional recipe.
6. A fan with lines top and bottom is fan assisted, not true fan.Here the conventional elements heat and the fan only stirs the air. It runs hotter at the top than true fan and is not as good for baking on two shelves at once. Worth knowing which of the two your oven has.
7. A fan with a line at the bottom is the pastry setting.Fan plus base heat. It drives more heat into the base than the top, which is exactly what a quiche, a pizza or a blind-baked case needs.
8. A fan with a line at the top is fan grill.The grill runs while the fan circulates, so thicker pieces cook through instead of charring on the outside. Use it at a lower dial setting than you would a plain grill.
9. Learn the three symbols that are not heat sources.A lightbulb is the interior lamp on its own. A droplet or a steam cloud injects water into the cavity. A padlock, often with a high temperature such as 480°C beside it, is the pyrolytic clean cycle, which locks the door for the duration.
10. Check the manual only for the one or two your oven does differently.Brands add their own: a plate symbol for keep warm, a snowflake for defrost with the fan only and no heat, a fish or bread pictogram for a preset. Everything structural is in the square-and-lines convention.

Tips

• If the dial has both a fan-in-a-circle symbol and a fan-with-top-and-bottom-lines symbol, you have both true fan and fan assisted. Use the circle one for baking.
• A snowflake or fan-only symbol with no element marked runs the fan cold. It defrosts and it is also the fastest way to cool a hot oven before a pyrolytic cycle.
• The symbol printed beside the temperature dial rather than the function dial is often the pyrolytic cycle — on many ovens the clean cycle is selected on the function dial and its duration on the temperature dial.

Common mistakes

• Treating fan assisted and true fan as the same setting — They heat differently. Fan assisted is hotter at the top and does not give the even multi-shelf result true fan does, so a recipe reduced by 20°C on the wrong one browns unevenly.
• Using the half grill for a full tray — Only the centre of the element lights, so the ends of the tray sit in comparatively cool air and cook at a completely different rate.

Questions people ask