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EA

EA — Flame not detected or lost

Worcester Bosch · Boilers

What does EA mean?

The boiler's flame was not detected or the flame signal was lost during operation. This often points to an issue with the gas supply or ignition system.

Common Causes

  • No gas supply to the boiler.
  • Faulty igniter or electrode.
  • Problem with the gas valve.
  • Power supply issue to ignition components.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check that your gas supply is turned on and other gas appliances are working.

  2. 2

    Reset the boiler using the dedicated reset button.

  3. 3

    If the flame still isn't detected, contact a Gas Safe registered engineer, as gas components require professional attention.

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 35)Search more codes in this manual