FAQ Series: Worcester Boiler Error Codes – What They Mean and What to Do

Introduction

Worcester Bosch boilers are known for their efficiency and reliability, but like all appliances, they can sometimes display error codes. These codes help diagnose problems, and in some cases, you can resolve the issue yourself.

This guide will walk you through common Worcester boiler fault codes, what they mean, and when to call a Gas Safe engineer.

DIY-Friendly Worcester Error Codes

• EA 227 – No Flame Detected
  • Possible Cause: Gas supply issue, ignition failure, or frozen condensate pipe.
  • What to Do:
    • Ensure the gas supply is on and working.
    • If it’s cold outside, check for a frozen condensate pipe and carefully thaw it.
    • Try resetting the boiler.
• A1 281 – Pump Running Dry
  • Possible Cause: Low system pressure or trapped air.
  • What to Do:
    • Check your boiler’s pressure gauge. If it's below 1.0 bar, re-pressurise the system using the filling loop.
    • Bleed radiators to remove trapped air.
• E9 224 – Overheat Fault
  • Possible Cause: Overheating due to lack of water circulation.
  • What to Do:
    • Ensure radiators are fully bled.
    • If the issue persists, call an engineer.
• C6 215 – Fan Speed Too High
  • Possible Cause: Faulty fan or air pressure issue.
  • What to Do:
    • Turn off the boiler and reset it.
    • If the code persists, seek professional help.

When to Call an Engineer

Certain faults require a trained engineer to diagnose and repair safely:

• E2 222 – Flow Temperature Sensor Fault
• F0 238 – Control Board or Gas Valve Error
• E9 219 – Safety Thermostat Fault
• FA 306 – Gas Valve Fault or Flame Detection Issue

If you see any of these error codes, avoid attempting complex repairs yourself. A Gas Safe engineer can diagnose and fix the issue safely.