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Worcester Bosch Greenstar RI Heat Only fault 12

Fan fault

Gas boiler

What it means

Locking fault covering multiple fan-related conditions: fan running too fast, fan running too slow, no airflow detected after a defined period of time, or fan not running.

Likely causes

  1. Defective fan
  2. Blocked air way

Where to start

  1. Check fan operation and speed
  2. Check air pathway for blockages

The full answer, free

  • How to put it right, step by step
  • The manual page for this fault (page 55), 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 RI Heat Only. Check the model on the data plate before you order parts.

Other Worcester Bosch Greenstar RI Heat Only fault codes