BoilerFaultCodesVokera AL41 Fault Code
The Vokera AL41 fault code means: your boiler has detected that the water pressure in the system is too low to operate safely and has shut down to protect itself.. It appears on 12 Vokera models in our database.
Technical description: Check system pressure – refill if necessary. If fault reoccurs, contact a heating engineer.
What causes the Vokera AL41 fault?
This fault occurs when the internal sensor detects that there isn't enough water volume within the central heating circuit to safely transfer heat. The most common reasons are a slow leak from a radiator valve or the pressure dropping naturally after you have recently bled air from your radiators.
This fault is frequent in autumn when homeowners turn their heating back on for the first time and find the pressure has dropped over the summer months.
DIY fix possible
Locate the filling loop (usually a silver flexible hose) underneath or near the boiler.Slowly open the one or two taps/valves on the filling loop until you hear water moving.Watch the pressure gauge and close the taps firmly once the needle reaches between 1.0 and 1.5 bar.Press the 'Reset' button on the boiler control panel to clear the error.
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Vokera models that show the AL41 fault code
Click a model for the full fault code list and model-specific repair notes.
- Eclipse Repair: £0-120
- Mynute 10E Repair: £0-120
- Mynute 23E Repair: £0-120
- Mynute 28E / 35E Repair: £0-120
- Mynute Vhe Repair: £120-250
- Sabre 29H Repair: £80-160
- Sabre 35H Repair: £0-120
- Syntesi 25 Repair: £0-120
- Syntesi 29 Repair: £0-120
- Syntesi E Repair: £0-120
- Unica 24HE Repair: £0-120
- Unica HE Repair: £0-120
Source
Vokera AL41 fault code information on this page is sourced and cross-checked against the official Vokera service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026