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Worcester Bosch Greenstar RI Heat Only fault 11

HCM (heat control module) defective

Gas boiler

What it means

Locking fault indicating the HCM (Heat Control Module) is defective, incorrect, faulty, or missing.

Likely causes

  1. Incorrect HCM fitted
  2. Faulty HCM
  3. Missing HCM

Where to start

  1. Check HCM is correct item for the boiler
  2. Check HCM is present and correctly fitted

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