H.02.09 Low

Baxi H.02.09 Fault Code

Also written as H0209 — same fault.

The Baxi H.02.09 fault code means: your boiler has detected very low temperatures and is automatically running its frost protection mode to prevent the internal pipes from freezing.. It appears on 7 Baxi models in our database.

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description: Partial stoppage — antifreeze function active
Typical repair cost £0-80 (including labour)

DIY fix possible

Check that your main gas and electricity supplies are still turned onEnsure your thermostat is turned up or the boiler is not in 'off' modeCheck for any frozen sections of the condensate pipe outside your home and thaw them with warm water

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Baxi models that show the H.02.09 fault code

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

Source

Baxi H.02.09 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 7 July 2026