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Worcester Bosch Greenstar 4000 System fault 208

Post-purge/pump run-on after chimney sweep mode exit

Gas boiler

What it means

Boiler status code 208 is displayed when exiting chimney sweep mode. The pump continues to run in order to cool the heat exchanger before returning to normal operation.

Likely causes

  1. Normal operational status following high-output test running in chimney sweep mode
  2. Incorrectly set pump rate or pump characteristic map

Where to start

  1. Confirm chimney sweep mode was exited via ok or back button
  2. Allow pump to continue running until cooling cycle completes
  3. Navigate to Info menu to view Current status

The full answer, free

  • 5 more checks in order
  • How to put it right, step by step
  • The manual page for this fault (page 45), right under the answer
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Safety: Isolate gas and power before you open the case. If you have been into the gas side, do a tightness test, and a combustion and flue check before you hand back. Gas Safe (UK) or RGI (Ireland) work only.

From the Worcester Bosch manual for the Greenstar 4000 System. Check the model on the data plate before you order parts.

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