E0
FAULT CODE
Viessmann
Safety Temperature Limiter Triggered
High Severity
Engineer Required
The boiler has exceeded its maximum safe water temperature. The safety limiter has shut down the boiler to prevent damage.
Step-by-Step Fix Guide
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Step 1
Let the boiler cool down completely before resetting
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Step 2
Check the system pressure and repressurise if needed
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Step 3 Engineer only
A Gas Safe engineer should check for pump failure, airlocks, or blocked pipes
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.