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Vaillant TURBOmax Plus 828 E F28 fault code

June 15, 2025

Vaillant TURBOmax F28 fault code

Vaillant TURBOmax Plus 828 E F28 ignition fault

This is a clip of an old Vaillant TURBOmax combi boiler going to ignition lockout, which on these boilers results in an F28 or F.28 fault code.

The F28 fault code on these boilers is an ignition fault, and it means that the printed circuit board did not detect a flame on the burner.

Ignition fault codes on any boiler are probably the most common and could be caused by a number of things including an issue with the gas supply, an issue with the gas valve, an issue with the printed circuit board, or a blocked or frozen condensate trap(not applicable to old TURBOmax boilers they’re non condensing).

In the case of this particular boiler the burner and burner injectors required cleaning.

This boiler only has one attempt at successful ignition and then goes to the F28 fault code.

Because the left side of the burner where the flame detection probe sits doesn’t light straight away, the boiler doesn’t detect a flame and goes to ignition lockout.

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I’ve used Richard to service my boiler for several years. He is extremely professional, knowledgeable and thorough. The first time he looked at my boiler he fixed a problem that several other engineers had failed to fix, and even refunded me when a part he had bought turned out not to be needed. Real integrity and a desire to do the best for his customers. I don’t think you’ll find anyone better.

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I can’t recommend Richard highly enough. He came to fix our boiler at short notice, provided a comprehensive service and has given it a new lease of life. He had all the parts required so no delays in waiting for parts. He is extremely knowledgable and competent and clearly passionate about what he does. Thank you!

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Article by Rich

Rich is a Gas Safe registered heating industry professional that specialises in boiler repairs and maintenance on Vaillant boilers and some of their Glowworm derivatives. He has over 15 years worth of experience working in the heating industry, and well over a decades worth of experience working on Vaillant boilers.