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Boiler Error Codes

  • Writer: George Forward
    George Forward
  • Apr 22
  • 3 min read

Boiler Error Codes Explained: Common Faults & Simple Fixes in Bexhill & Hastings

Boiler problems always seem to happen at the worst possible time—usually when you need heating or hot water the most. If your boiler is showing an error code, it can be worrying, but many common faults are easier to understand (and sometimes fix) than you might think.

In this guide, we explain the most common boiler error codes, what they mean, and what you can do before calling a professional heating engineer.

First Things First: Try a Reset

Before looking into specific fault codes, always try this simple step:

👉 Turn your boiler off at the wall and leave it for 10–15 minutes, then switch it back on.

This reset can often clear minor faults and get your system back up and running.

Most Common Boiler Issues

Low Water Pressure

Common error codes:F1 / L1 (Ideal), F22 / E119 (Worcester), F22 (Vaillant)

Low pressure is one of the most common boiler issues and is usually quick to fix.

How to fix it: Use the filling loop to top up your boiler pressure to between 1 and 1.5 bar.

Ignition Fault / Flame Loss

Common error codes:F2 / L2 (Ideal), F28 / EA / E133 (Worcester), F28 / F29 (Vaillant)

This means your boiler is struggling to ignite or keep a flame going.

What to check:

  • Is your gas supply working? (Try another gas appliance)

  • Is your gas meter on and topped up?

  • Try pressing the reset button

👉 If the issue continues, it’s best to call a professional.

Frozen or Blocked Condensate Pipe

Common error codes: EA / D5 (Worcester)

This is especially common during cold weather in the UK.

How to fix it: Locate the external white plastic pipe and carefully thaw it using warm (not boiling) water.

Overheating

Common error codes:E110 / E131

Overheating is often caused by trapped air or poor circulation.

How to fix it: Bleed your radiators to remove air and improve system flow.

Common Error Codes by Manufacturer

Ideal Boilers

  • F1 / L1: Low pressure or overheating

  • F2 / L2: Ignition fault or flame loss

  • F3 / F4: Fan or sensor fault

Worcester Bosch Boilers

  • F22 / E119: Low pressure

  • F28 / EA / E133: Ignition fault

  • F75: Pump or pressure issue

  • D5 / EA: Condensate pipe blocked or frozen

Vaillant Boilers

  • F22: Low pressure

  • F28 / F29: Ignition fault

  • F75: Pressure sensor fault

  • F27: Flame detection fault

When Should You Call a Professional?

While some boiler issues can be safely checked yourself, you should contact a qualified engineer if:

  • The error code keeps coming back

  • The boiler won’t reset

  • You have ignition faults that persist

  • You see codes like F75, F3, or F4

  • You’re unsure what the issue is

Attempting more complex repairs without the right experience can lead to further damage or safety risks.

Boiler Repairs in Bexhill, Hastings & Eastbourne

At Forward Thermal and Flow, we provide reliable boiler fault finding and

repairs across:

  • Bexhill-on-Sea

  • Hastings

  • Battle

  • Eastbourne

  • Surrounding areas

Whether it’s low pressure, ignition faults, or ongoing boiler issues, our experienced team is here to help keep your property safe, warm, and running efficiently.

Need Help With Your Boiler?

If your boiler is showing an error code or not working properly, don’t leave it to chance.

👉 Get in touch with Forward Thermal and Flow today for fast, professional support.

 
 
 

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