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Worcester Bosch Greenstar 4000 Combi fault 2970

Pressure drop in heating system too rapid

Gas boiler

What it means

Too many unexpected pressure drops detected within a short time period; may occur if intelligent filling loop is activated and system then vented.

Likely causes

  1. Intelligent filling loop activated with system venting
  2. System leak or venting

Where to start

  1. Switch off the intelligent fill in the system menu
  2. Re-pressurise manually and vent the system
  3. Ensure the correct pressure

The full answer, free

  • 14 more checks in order
  • The readings and component tests from the manual
  • How to put it right, step by step
  • The manual page for this fault (page 78), 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 Combi. Check the model on the data plate before you order parts.

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