Vaillant Ecomax Pro 828E Fault Codes

Combi Natural Gas 28 kW 2001-2006 Discontinued

GC Number: 47-044-21

Replaced by: ecoTEC plus 831

The fault code is already on your display

Note it down before pressing reset — resetting clears the code immediately. How to read fault codes →

Most common fault codes

Code	Severity	Plain English	DIY
F.11	High	Your boiler has detected that water isn't moving through the internal pipes correctly, causing it to shut down to prevent overheating.	Yes
F.12	High	Your boiler has detected a internal blockage that is preventing water from flowing correctly and affecting the pressure.	Engineer
F.13	High	Your boiler has stopped working because the water pressure is too low, and it has shut down to prevent damage.	Yes
F.21	High	Your boiler has stopped working because it cannot light the flame or keep it burning properly.	Yes
F.22	High	Your boiler has stopped working because the water pressure is too low for it to operate safely.	Yes

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