Worcester Bosch Gas Valve & Bracket Assembly — Part No. 8716117868 (SIT 848 Sigma | Greenstar Compact)

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Worcester Bosch Gas Valve & Bracket Assembly  8716117868

Restore safe ignition and stable combustion on Worcester Greenstar Compact boilers. This OEM assembly uses a SIT 848 Sigma combination gas valve with a factory-calibrated regulator to deliver consistent burner pressure and dependable starts.

Key Features

  • Worcester Bosch part: 8716117868 — SIT 848 Sigma valve on mounting bracket
  • Direct-fit replacement; includes seals/fastener as supplied by the manufacturer
  • Designed for Greenstar Compact ranges (CDi/Si/i System/RI Compact, incl. many ErP variants)
  • Genuine OEM part with manufacturer warranty

Typical Compatibility*

  • Greenstar CDi Compact 28/32/36 (NG & LPG, incl. ErP)
  • Greenstar Si Compact 25/30 (NG & LPG, incl. ErP)
  • Greenstar i System Compact 27/30 (NG & LPG)
  • Greenstar RI Compact 27/30 (NG & LPG, incl. ErP)
  • Legacy 533/535 Compact models

*Model coverage varies by production run; always match by exact part number 8716117868 and your boiler’s exploded diagram.

Symptoms of a faulty gas valve

  • Boiler won’t light or repeatedly locks out at start-up
  • Unstable flame / irregular burner pressure

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