BoilerFaultCodesVokera E28 Fault Code
The Vokera E28 fault code means: your boiler has shut itself down as a safety precaution because it has detected an internal fault that could lead to overheating or poor performance.. It appears on 2 Vokera models in our database.
Technical description: The safety devices have been activated (lockout)
What causes the Vokera E28 fault?
This fault occurs when the boiler's control system detects that the internal temperature has exceeded safe limits or that water is not moving through the heat exchanger correctly. The most common reason is a failure in the communication between the temperature sensors or a pump that has seized and stopped circulating water. To prevent damage to the internal components, the boiler enters a protective shutdown mode.
This issue is more frequent during the first cold spell of autumn when pumps that have been idle all summer often struggle to restart or seize up.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Gas Safe Register →Vokera models that show the E28 fault code
Click a model for the full fault code list and model-specific repair notes.
Source
Vokera E28 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