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Weber Summit A4 BB ignition system module new in package

weber

Weber 42321 Ignition System Summit A4 BB appliance part

SKU CH-6YH9-YA9VK

Replacement ignition system for Weber Summit A4 barbecues, compatible with 24 listed models

  • Sold asEach
  • Product typeGrills & Accessories
  • Genuine Weber replacement ignition system for Summit A4 BB grills
  • Compatible with 24 Weber Summit models including 7810009 and 5210001
  • Also fits Turbo model XG6THSSN for broader application
  • New factory part number WEB42321 ensures exact fit and function
  • First listed by manufacturer on 31 December 2025 for current production

Weber Summit A4 ignition system

This replacement ignition system fits Weber Summit grill models produced in 2003 and 2004. It also fits the Turbo XG6THSSN model. The part restores reliable spark generation for burners that have stopped lighting.

Simple push-in installation

The module connects to the existing wiring harness and mounts in the original location. No soldering or specialised tools are required. Mis-routing the electrode leads is the most common error and will prevent individual burners from sparking.

Verify your grill model before ordering

Confirm that the rating plate on your Summit shows one of the listed model numbers such as 7810009, 21285 or 5210001. The part will not fit Summit models manufactured outside the 2003 to 2004 range or other Weber series.

How it compares

Measured against everything we stock in Replacement Grill & Appliance Parts, at today’s prices. Recalculated every night.

Price $95.99
Pricier than about 81% of the 1,446 comparable items (median $36.99).

Specifications

Product
Brand nameWeber
Part numberWEB42321
Product typeGrills & Accessories

Questions about this item

How can I verify the Weber 42321 ignition system is working after installing it on my Summit Silver A LP (2003-2004) grill?

Press the ignition button on each burner control knob; a visible spark at every electrode and immediate burner lighting confirms the WEB42321 is functioning correctly.

What components come with the Weber 42321 ignition system and what must I supply separately?

The WEB42321 ignition module is sold as a single unit; mounting hardware, electrode leads, and the battery required for spark generation are not included and must be purchased separately.

Which Weber Summit models are compatible with the 42321 ignition system so I can confirm the right fit?

The 42321 fits 24 Weber models including 7810009, 21285, 5210001, 7710001, 21282, 5210509, 5810009, SUMMIT SILVER NG (2003-2004), 5710001, 21281, 5310509, 21286, 5310001, 21322, 5210009, 7710009, 7810001, 5810001, 21321, 5310009, 5710009, SUMMIT SILVER A LP (2003-2004), 5310501, 5210501.

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