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Blue light flashing / Alert symbol

Blue light flashing and Alert symbol on display — Appliance fault detected.

Worcester Bosch · Greenstar i ErP Boilers

What does Blue light flashing / Alert symbol mean?

When the appliance detects a fault, an alert symbol and a fault code will be displayed on the screen, and the blue operation/fault light will flash. This is a general indication of a system fault.

Common Causes

  • An internal safety system detected an operational issue.
  • Various internal malfunctions or component failures.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Note the fault code and any three-digit number displayed on the screen (e.g., 'EA' and '227').

  2. 2

    Press the reset button briefly once to try and clear the fault.

  3. 3

    If the reset is unsuccessful or the alert code reappears, contact Worcester, Bosch Group for assistance, quoting the displayed code.

Browse all codes in this manual (6)
Verified technical data. Last updated: April 2026

Related Faults

Blue light flashingBlue light flashing — Possible fault alertEAEA fault code flashing on display — No gas, blocked condensate, or blocked flue.No blue lightNo blue Operation/Fault Indicator demand light — No heat demand or power issue.
Source: Worcester Bosch Greenstar i ErP Boilers
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