BoilerFaultCodesViessmann E07 Fault Code
The Viessmann E07 fault code means: your boiler is unable to light because the internal fan isn't spinning fast enough to clear the system or provide the correct air flow.. It appears on 1 Viessmann model in our database.
Technical description: Burner does not start. Fan speed too low during burner start.
What causes the Viessmann E07 fault?
This fault occurs when the boiler's control system detects that the fan isn't reaching the necessary speed to safely clear the combustion chamber and start the burner. The most common reasons are a build-up of dust or debris slowing the fan's rotation, a failing motor, or a communication error where the main control board can no longer regulate the fan's power.
Engineer required
This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.
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Gas Safe Register →Viessmann models that show the E07 fault code
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Source
Viessmann E07 fault code information on this page is sourced and cross-checked against the official Viessmann service / installation manuals for each affected model.
Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026