0A5
FAULT CODE
Alpha
Fan Speed Fault (ProTec Plus)
High Severity
Engineer Required
On Alpha ProTec Plus boilers, 0A5 indicates a fan speed fault — flue or ventilation issue.
Step-by-Step Fix Guide
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Step 1
Turn off the boiler
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Step 2 Engineer only
Call a Gas Safe engineer to inspect the fan and flue
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.