224 V
FAULT CODE
Worcester Bosch
Safety Temperature Limiter Tripped (8000 Series)
High Severity
Engineer Required
On 8000 Series boilers, code 224 V means the safety temperature limiter has operated. 'V' indicates a lockout requiring reset. Repressurise the system and reset.
Step-by-Step Fix Guide
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Step 1
Check system pressure and top up to 1.5 bar if below 1 bar
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Step 2
Allow the boiler to cool for 20 minutes
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Step 3
Reset using the reset button
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Step 4 Engineer only
If fault returns, call a Gas Safe engineer to inspect pump and system circulation
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.