A Remeha Avanta Plus E5 Fault Code usually indicates an ignition problem that prevents the boiler from lighting correctly. One of the most common causes is a failed burner seal, which deteriorates over time due to repeated heating and cooling cycles.

Fortunately, this is a well-known issue on the Remeha Avanta Plus range and, in most cases, can be resolved quickly by replacing the original rope-style burner seal with the updated graphite seal.

This guide explains what the E5 fault code means, how to diagnose the problem correctly, and when additional components may require attention.

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What Does the E5 Fault Code Mean?

The E5 fault code indicates that the boiler has failed to establish or maintain ignition.

Although several ignition-related faults can trigger this code, the most common cause on the Remeha Avanta Plus is deterioration of the burner seal.

As the seal ages, combustion gases can escape around the burner, disrupting the ignition process and causing repeated lockouts.

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Common Symptoms of an E5 Fault

You may notice one or more of the following symptoms:

• Boiler repeatedly attempts to ignite.
• Ignition fails.
• Boiler locks out, displaying an E5 error.
• Heating and hot water stop working.
• Intermittent operation before complete failure.

If these symptoms occur, the burner seal should be inspected first.

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How to Repair a Remeha Avanta Plus E5 Fault

Important: Repairs must only be carried out by a qualified Gas Safe registered engineer.

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Step 1 – Remove the Burner Cover

Remove the front burner cover to gain access to the burner assembly.

The burner is secured using three retaining screws.

Carefully remove the screws and lift away the burner cover.

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Step 2 – Inspect the Burner Seal

Behind the burner cover is the original rope-style burner seal.

This seal commonly fails due to:

• Heat deterioration
• Compression over time
• General ageing

If the seal shows signs of damage, flattening, cracking, or deterioration, it should be replaced.

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Step 3 – Install the Updated Graphite Seal

Remeha introduced an improved graphite burner seal that offers a more reliable long-term repair.

Replacement Seal Part Number:

720480101

Ensure the new seal is fitted evenly around the burner assembly before reassembling the boiler.

A correct seal is essential for safe combustion and reliable ignition.

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Step 4 – Reassemble the Boiler

Refit the burner cover and tighten the three retaining screws evenly.

Once reassembled, carry out the manufacturer’s recommended safety checks and combustion analysis before returning the appliance to service.

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Still Getting an E5 Fault?

Although uncommon, if the E5 fault remains after replacing the burner seal, the next component to inspect is the ignition system.

The most likely cause is:

Spark Generator Failure

A faulty spark generator may produce a weak or inconsistent spark, preventing reliable ignition.

If confirmed through testing, the spark generator should be replaced.

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Why Does the Burner Seal Fail?

The original rope-style seal is exposed to constant high temperatures.

Over many years of operation, it gradually:

• Becomes compressed
• Hardens
• Loses elasticity
• Allows combustion gases to escape

The updated graphite seal provides improved durability and a much longer service life.

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Preventing Future Boiler Faults

Regular annual boiler servicing can identify worn burner seals before they cause breakdowns.

During a professional service, a Gas Safe engineer will inspect:

• Burner condition
• Ignition components
• Heat exchanger
• Fan operation
• Combustion performance
• Safety devices
• Flue integrity

Preventative maintenance often avoids unexpected boiler failures during the colder months.

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Why Choose Certificates4UK Ltd?

Certificates4UK Ltd has been providing professional boiler repairs and Gas Safety services since 2011.

We regularly diagnose and repair boilers from leading manufacturers including:

• Remeha
• Worcester Bosch
• Vaillant
• Ideal
• Viessmann
• Vokera
• Baxi

Our engineers provide professional boiler diagnostics, servicing and repairs throughout Surrey.

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Areas We Cover

We provide boiler repair services across Surrey, including:

• West Molesey
• East Molesey
• Esher
• Thames Ditton
• Walton-on-Thames
• Weybridge
• Surbiton
• Kingston upon Thames
• Richmond
• Wimbledon

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Frequently Asked Questions

Can I continue using my boiler with an E5 fault?

No. The boiler has entered a safety lockout and should be inspected by a qualified Gas Safe engineer before being returned to service.

Is the burner seal a common fault?

Yes. The original rope-style burner seal is a well-known wear item on many Remeha Avanta Plus boilers.

Can I replace the burner seal myself?

No. The burner forms part of the boiler’s combustion system and should only be removed and replaced by a Gas Safe registered engineer.

What is the replacement burner seal part number?

The updated graphite burner seal is:

720480101