vaillant 428 ecotec open vent bolier


Postby Jules3011 » Mon Nov 28, 2011 9:35 pm

I have noticed on occasions that the bolier shuts down for a period of time even though the room stat is calling for heat. The orange ,white and gray wires on the mid position v/v are live thus providing a live feed to the boiler . In this instance the boiler is not providing a live feed to the pump ., is this normal with this type of boiler or have I got an intermitant fault on the boiler.
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Postby plumbbob » Tue Nov 29, 2011 8:32 pm

No boiler will fire continuously when the heating is on. The boiler will shut down when the water temperature reaches the pre-set level. Once the water in the system cools as the radiators give out heat, the boiler will fire again to warm the water.
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