What does the Baxi H.01 – .05 fault code mean?

Your boiler has detected that the water is heating up too quickly or isn't circulating properly through the system.

How much does it cost to fix Baxi error code H.01 – .05?

Typical repair cost for the Baxi H.01 – .05 fault is £120-280 including labour.

Can I fix Baxi fault code H.01 – .05 myself?

Check that the boiler pressure is between 1 and 1.5 bar on the gauge

Baxi H.01 – .05 Fault Code: What It Means & How to Fix It

Technical description

Difference between the flow and return temperature is too high, sensor error or insufficient circulation.

What causes this fault?

This fault occurs when heat isn't being moved away from the boiler's internal heat exchanger fast enough, causing a rapid temperature spike. The most common reasons are a failing circulation pump, a blockage in the system pipework, or air trapped within the unit preventing water flow.

This issue often surfaces during the first cold snap of autumn when the heating is turned on after being dormant all summer, which can cause the pump to seize.

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.

Find a Gas Safe engineer

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Your boiler has detected that the water is heating up too quickly or isn't circulating properly through the system.

Technical description

What causes this fault?

Engineer required

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