433
FAULT CODE
Baxi
Heat Exchanger Overtemperature (EcoBlue)
High Severity
Engineer Required
The heat exchanger temperature has exceeded 95°C. This is a more severe overheat condition than the standard E110 code.
Step-by-Step Fix Guide
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Step 1
Turn off the boiler immediately
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Step 2
Allow to cool completely
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Step 3 Engineer only
Call a Gas Safe engineer to investigate — the heat exchanger, pump, and circulation must be checked
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.