My boiler keeps shutting down. What could be
many causes of a boiler shut off. One possible cause is called low water
cut-off. Low water cut-off prevents serious damage to the boiler by cutting off
the burner if the water level in the boiler should drop too low. There
are three things that must be in place for a boiler to operate properly: water,
fire, and the recommended steam pressure.
of these items has to be in a perfect working order as preset by the
manufacturers. Water in a boiler is filled by an electric pump called the feed
pump. This feed pump automatically cuts off when water in a boiler reaches a
required level. This
is the time when the fire ignites. The fire in a boiler only ignites when a
boiler is filled up with a required water level.
smooth running conditions the fire will cut off when a required steam pressure
is achieved, which means the water has turned into high-pressure steam. While
the steam is being consumed in a plant the water level in the boiler is
gradually going down. At a pre-set low level of water, the feed pump will turn
on to bring up the required water level. The fire will ignite again at the
required level. A low level of water prevents the boiler from igniting.
cause of low water level in the boiler is mainly due to the malfunction of a
“check valve.” This valve is situated on the water feed line connecting the
boiler and the feed pump. The purpose of having this valve on the feed line is
to prevent steam from backing out of the boiler to the feed pump. If the check
valve is malfunctioning, the steam from the boiler will pass into the feed
pump. When the feed pump turns on it will be filled with steam, which it cannot
pump. No water will be going into the boiler. Thus, the boiler will shut down
because of the improper water level.
The “check valve” needs to be replaced.