What does the Baxi E.01 – .20 fault code mean?

Your boiler has switched itself off because it has become too hot inside, likely due to water not flowing correctly or a faulty internal sensor.

How much does it cost to fix Baxi error code E.01 – .20?

Typical repair cost for the Baxi E.01 – .20 fault is £120-350 including labour.

Can I fix Baxi fault code E.01 – .20 myself?

Check that your home's radiator valves are fully open

Baxi E.01 – .20 Fault Code: What It Means & How to Fix It

Technical description

Maximum flue gas temperature reached. No circulation or sensor fault.

What causes this fault?

This fault occurs when the internal temperature of the boiler rises dangerously high, triggering a safety shut-off to prevent damage. The most common reason is that water isn't moving through the system quickly enough to carry heat away, often due to a pump failure or a blockage. It can also be caused by a build-up of debris inside the heat exchanger that prevents efficient heat transfer.

Engineer required

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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Your boiler has switched itself off because it has become too hot inside, likely due to water not flowing correctly or a faulty internal sensor.

Technical description

What causes this fault?

Engineer required

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