BoilerFaultCodesAlpha FE95 Fault Code
The Alpha FE95 fault code means: your boiler is having trouble reading the temperature of the water flowing through your system because of a faulty connection or sensor.. It appears on 3 Alpha models in our database.
Technical description: External flow sensor out of range or short circuit/External flow sensor measures a temperature outside of normal workingrange.
What causes the Alpha FE95 fault?
This fault occurs when the internal computer loses reliable communication with the sensor responsible for measuring the temperature of the water leaving the boiler. The most common reason is a physical failure of the sensor’s internal components or a loose connection in the wiring that prevents the system from reading accurate data. Because the boiler no longer knows how hot the water is, it shuts down as a safety precaution to prevent overheating.
This fault may become more apparent during the first cold snap of autumn when the heating system is pushed to operate at higher temperatures for the first time in months.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Alpha models that show the FE95 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Alpha FE95 fault code information on this page is sourced and cross-checked against the official Alpha service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026