F16
FAULT CODE
Cold Weather Note
Pressure drops may be more common in cold weather.
Step-by-Step Fix Guide
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Step 1
Repressurise to 1.0-1.5 bar via the filling loop
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Step 2
Reset the boiler
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.