E5
FAULT CODE
Worcester Bosch
Flow Temperature Too High
High Severity
Engineer Required
The boiler flow temperature has exceeded 105°C — the maximum safe limit. A serious overheat condition.
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 for at least 30 minutes
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Step 3
Do not reset without first calling a Gas Safe engineer
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Step 4 Engineer only
This typically indicates pump failure or heat exchanger scale build-up
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.