F22
FAULT CODE
Heatline
Low Water Pressure
Low Severity
DIY Check Possible
System water pressure has dropped below the safe minimum for the boiler to operate.
Step-by-Step Fix Guide
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Step 1
Repressurise the system to 1.5 bar using the filling loop
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Step 2
The boiler should restart automatically — press reset if needed
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Step 3
If pressure drops again, contact a Gas Safe engineer to check for leaks
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.