Can a non-functional air vent prevent a boiler from heating?

A non-functional air vent can indeed prevent a boiler from heating effectively, which is why the selected answer regarding high pressure limiting control provides valuable insight. When an air vent malfunctions, it can lead to an accumulation of air within the system. This trapped air can create pressure build-up, which in turn may engage the high pressure limiting control of the boiler.

The high pressure limiting control is a safety mechanism designed to prevent excessive pressure from damaging the boiler or its components. If the pressure exceeds a predetermined limit due to air preventing proper water circulation and steam production, the control will shut off the boiler to avoid harm.

In systems where proper venting is critical for the movement of steam and water, a malfunctioning vent can disrupt normal operation and lead to heating issues or complete failure to heat. Hence, understanding the relationship between air vent functionality and the boiler's pressure control mechanisms is essential for troubleshooting heating issues in a boiler system.