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Worcester Bosch Greenstar RI Heat Only fault 1

No ionisation detection after ignition

Gas boiler

What it means

Locking fault. Failure of four ignition attempts; the boiler waits 30 seconds before another attempt is made.

Likely causes

  1. Failure of ignition attempts
  2. No flame detected via ionisation after ignition

Where to start

  1. Check ignition electrode and gas supply
  2. Check ionisation electrode connection

The full answer, free

  • How to put it right, step by step
  • The manual page for this fault (page 53), 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