Low
d.64 on Vaillant ecoTEC sustain

This code is simply an information display showing how long your boiler takes to light the flame on average, rather than an error or a fault with your heating system.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

Technical description

Average burner ignition time: Current value in seconds

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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