12012910 Genuine Small Burner Diffuser for Bosch, Siemens, Neff Gas Cooktops, BSH Small Flame Spreader Crown Replacement Part

Need the small diffuser for a BSH gas burner? Part 12012910 is the genuine small size, the ported ring that carries gas up under the cap and spreads it into the flame. It belongs to Bosch, Siemens and Neff gas cooktops that use this number. The smallest burner on a cooktop is often the auxiliary, used for simmering, but the burner position isn't on our record, so compare sizes before ordering.

Small burner flame patchy or hard to light?

A small burner tends to be the one used for simmering sauces and keeping food warm, so it spends long periods on a low flame. That makes an even gas spread especially important. When the diffuser warps, cracks or clogs with burnt-on spills, the low flame can flicker, go out, burn on one side only or refuse to catch from the spark. You might also see the flame lifting off the ports, or a yellow, sooty flame. A new diffuser restores the correct port pattern so the flame sits close and steady.

Part details

• Genuine BSH part 12012910
• Small size burner diffuser
• Spreads the gas flow evenly under the cap
• For BSH gas cooktops that list this number

Replacing a small burner diffuser

Turn off the cooktop and wait for it to cool fully. Take off the cap and pull the old diffuser straight up. Wipe the burner base clean and dry, and check the spark electrode isn't cracked. Line the new diffuser up with its locating notch, seat it flat, then put the cap back on top. Test on a low setting. If the flame still won't stay alight, ask a licensed gas fitter to check the flame failure device.

Questions about this part

How do I check this is the right size?

Measure across the old diffuser and compare it with your cooktop's parts list, which shows the diffuser number for each burner. Our record calls 12012910 the small size. For help, send your E-Nr through the parts enquiry form.