Why does a short cycle boiler fire up?

The internal thermostat of a short cycling boiler will detect that the water in the heat exchanger is cooling and, although the temperature in your home has not dropped, fires up the boiler to reheat the water.

Why is my Vaillant Ecotec boiler not cycling?

While this is not a fault function in itself, the visibility of this function’s symbol on the display for prolonged periods could indicate there are other issues at play, such as circulation problems or incorrect setup of the system. This would require an engineer to correctly determine the system issue.

Who is the manufacturer of Ecotec boilers in the UK?

Vaillant is a German boiler manufacturer, which is well known in the UK. In May 2011, a Vaillant press release announced that it had achieved UK installation of one million EcoTEC boilers.

Why does my boiler keep going on and off?

A boiler that’s too powerful will produce more steam than it can condense which will cause short cycling. It will cycle on and off far too often and eventually overheat. In the past, engineers would generally fit boilers which were bigger than needed but modern boilers are so efficient that there’s no need for them to be oversized.

What happens when you short cycle your boiler?

Short cycling leads to a lot of wear and tear on the boiler and also leads to higher energy usage. Short cycling is not good! Short cycling results in the heating load being a lot smaller than the boiler’s heat output. An example would be the burner turning off for 4 minutes and turning back on in 4 minutes in repeating cycles.

How long does a boiler need to burn before shutting it off?

Generally speaking we want a boiler to fire at least 15 minutes before shutting the burner off on high limit. We can end short cycling by changing the design of our heating system. This is a very expensive solution that is not necessary.

Which is better zoned heating or short cycling?

Having a zoned heating system leads to higher comfort and should also lead to lower energy usage. However, as previously stated short cycling leads to higher energy usage. Generally speaking we want a boiler to fire at least 15 minutes before shutting the burner off on high limit.

What happens when you turn down the heat in a boiler?

Since the pressuretrol senses, the drop in pressure and the thermostat is screaming for heat, the boiler burner restarts the process. The air vents still are unable to let the air out and the pressure builds and shuts the burner down once more.