FAQ Series: Understanding and Solving Ideal Boiler Error Codes

Introduction

Ideal boilers are known for their reliability, but like all heating systems, they can occasionally display error codes when something goes wrong. These fault codes help diagnose the issue, and in some cases, you may be able to resolve it yourself.

This guide will walk you through common Ideal boiler fault codes, their meanings, and whether you need to call a Gas Safe engineer for repairs.

DIY-Friendly Worcester Error Codes

• F1 – Low Water Pressure
  • Possible Cause: The boiler's water pressure has dropped below the required level.
  • What to Do:
    • Check the pressure gauge. If it’s below 1.0 bar, re-pressurise the system using the filling loop.
    • If the pressure keeps dropping, check for visible leaks or call an engineer.
• F2 – Flame Loss
  • Possible Cause: The boiler isn’t detecting a flame, possibly due to a gas supply issue, ignition failure, or a frozen condensate pipe.
  • What to Do:
    • Ensure your gas supply is turned on and working.
    • Check for a frozen condensate pipe and carefully thaw it using warm (not boiling) water.
    • Reset the boiler. If the issue persists, call a professional.
• F3 – Fan Fault
  • Possible Cause: The fan isn’t operating correctly, preventing safe boiler operation.
  • What to Do:
    • Turn the boiler off and reset it.
    • If the code reappears, contact a Gas Safe engineer.
• F9 – Water Flow Issue
  • Possible Cause: A blockage, airlock, or pump failure preventing proper water circulation.
  • What to Do:
    • Bleed your radiators to remove trapped air.
    • If the code persists, a professional may need to inspect the pump or check for system blockages.

When to Call an Engineer

Some Ideal boiler error codes require a Gas Safe registered engineer to diagnose and repair safely:

• E2 – Flow Temperature Sensor Fault
• L1 – Overheating Fault
• F5 – Internal Boiler Fault
• E0 – Control Board or Gas Valve Error

If you see any of these error codes, avoid DIY repairs and seek expert assistance.