BoilerFaultCodesVokera Flashing red Fault Code
Also written as FLASHINGRED — same fault.
The Vokera Flashing red fault code means: your boiler has overheated, causing it to shut down automatically for safety.. It appears on 1 Vokera model in our database.
Technical description: High limit thermostat fault
What causes the Vokera Flashing red fault?
This fault occurs when the internal temperature of the boiler exceeds a safe limit, triggering a safety sensor to cut the power to prevent damage. The most common reasons are a blockage in the system or a pump failure, which stops the water from moving quickly enough to carry heat away from the burner.
This issue often appears during the first cold spell of autumn when the heating is turned back on after months of disuse, which can cause internal parts like the pump to seize.
DIY fix possible
Check that at least one radiator or bypass valve is fully openTurn the selector switch to the 'OFF/RESET' position for 10 secondsTurn the selector switch back to 'ON' and check if the red light stops flashing
Find a Gas Safe engineer
Search the official register for a qualified engineer in your area.
Gas Safe Register →Vokera models that show the Flashing red fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vokera Flashing red 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