H.01-.08
FAULT CODE
Baxi
Flow Temperature Rising Too Fast (200/400)
Medium Severity
Engineer Required
On Baxi 200/400 boilers, H.01-.08 indicates the flow temperature is increasing too quickly — insufficient circulation or sensor fault.
Step-by-Step Fix Guide
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Step 1
Check system pressure
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Step 2
Bleed radiators
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Step 3
Reset once
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Step 4 Engineer only
Call a Gas Safe engineer if fault persists
Gas Safe Reminder
Work on gas appliances must be carried out by a Gas Safe registered engineer. The steps above cover safe checks a homeowner can perform - any internal component replacement requires a qualified professional. If in doubt, always call an engineer.