Low
d.64 on Vaillant ecoTEC Plus 635

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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