H.01 – .14 High

Baxi H.01 – .14 Fault Code

Also written as H0114 — same fault.

The Baxi H.01 – .14 fault code means: your boiler has detected that it is getting too hot too quickly, usually because water isn't moving through the system properly.. It appears on 24 Baxi models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: Maximum flow temperature value exceeded or insufficient circulation – temporary fault.

What causes the Baxi H.01 – .14 fault?

This fault occurs when the water inside the boiler heats up much faster than the system can carry it away, causing it to reach a dangerous temperature in seconds. This is usually caused by a pump failure, a blockage in the pipes, or trapped air, all of which prevent the water from circulating properly. Essentially, the boiler is producing heat but has nowhere to send it, so it shuts down to prevent internal damage.

This fault is more frequent in autumn when heating systems are switched back on after being idle, as pumps can seize up or debris can settle during the summer months.

Typical repair cost £100-£350 (including labour)

DIY fix possible

Check that your boiler pressure is between 1 and 1.5 bar on the gauge.Ensure all radiator valves are fully open to allow water to flow.Restart the boiler to see if the temporary fault clears.

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Baxi models that show the H.01 – .14 fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Baxi H.01 – .14 fault code information on this page is sourced and cross-checked against the official Baxi service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026