Vaillant F29 fault code repair

Welcome to the fault-codes section of this site. The following table or page contains the information required to help repair and diagnose the fault codes being shown on the boiler display. You may be guided through the fault finding sequence or steps, for rectifying your boiler with this fault code. Suggested repair solutions may be provided by a link to a repair page. NB Some fault codes are only applicable to a specific range of boilers only.

Models applicable to:

Ecotec Pro/Plus, Ecotec Exclusive, Ecofit Pure

F29 Meaning:

Failure during operation: Re-ignition unsuccessful

F29 Causes:

According to the Vaillant Installation and Service book, the F29 fault code means ‘Gas supply temporarily stopped, flue gas recirculation, condensate duct blocked, defective earthing of product, ignition transformer has spark failure’

Statistical chances of faults

1. 40% Approx chance of Gas Supply Fault
2. 33% Approx chance of Gas Valve Fault
3. 30% Approx chance of other reasons being at fault.

Information is guidance only; repairs require qualified professionals. Affiliate links may earn us commissions at no extra cost. Do your own due diligence; we accept no liability.