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EA 229

EA 229 — Loss of ionisation signal during operation

Worcester Bosch · Boilers

What does EA 229 mean?

There was insufficient ionisation current detected by the system during the burning phase, or a general loss of ionisation signal. This indicates the flame is not consistently detected.

Common Causes

  • Faulty ionisation electrode.
  • Poor burner operation.
  • Incorrect gas/air ratio.
  • Gas supply fluctuations.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Ensure your gas supply is active and stable.

  2. 2

    Reset the boiler by pressing the reset button on the control panel.

  3. 3

    If the problem persists, contact a Gas Safe registered engineer, as this requires checking gas and ignition components.

Browse all codes in this manual (60)
Verified technical data. Last updated: April 2026

Related Faults

A1A1 — Water leak or pump dry runA1 281A1 281 — Pump stuck or running dryA3 317A3 317 — Flue gas temperature sensor short circuit
Source: Worcester Bosch Boilers
Open Manual (Page 40)Search more codes in this manual