27
FAULT CODE
Alpha
Insufficient Primary Flow
Medium Severity
Engineer Required
The boiler is not detecting adequate water flow through the primary circuit. Caused by blockage, restricted flow, airlocks, closed valves, or pump fault.
Step-by-Step Fix Guide
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Step 1
Check system pressure
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Step 2
Bleed all radiators
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Step 3
Ensure all valves are fully open
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Step 4
Reset the boiler
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Step 5 Engineer only
If fault persists, call a Gas Safe engineer to check the pump
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.