Vaillant Boiler F28
Vaillant Boiler F28. Since the flame is what enables the boiler to heat water, the. Although f28 is technically an ignition fault, there are several underlying issues that may cause it. caldera vaillant f 28 from www.cxtec.es If your vaillant water heater is stuck on f.28 or f.29, you have no hot water and the burner is not even starting, you need to reset the error code. What causes the f28 vaillant boiler error. A faulty or failed ignition is a relatively common issue with vaillant boilers and will be displayed as an f28 fault code which you need to look into. ...