E10
FAULT CODE
Alpha
Low Water Pressure
Low Severity
DIY Check Possible
The system water pressure has dropped below 0.6 bar — the minimum required for an Alpha boiler to operate safely.
Step-by-Step Fix Guide
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Step 1
Check the pressure gauge on the boiler or system
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Step 2
Use the filling loop to add water until pressure reaches 1.0–1.5 bar
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Step 3
Reset the boiler
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Step 4
If pressure drops repeatedly, check for leaks and call a Gas Safe engineer
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.