low water pressure switched

[navygas]

hi.
im new to the industry after 14 years in the navy. doing work for socail housing contractor to get experience. could someone be of help here.
combi boilers that have a low water pressure swtich will always have a corrosponding warning light on the boiler ie puma , ideal repsonse.?and thats the quickest way to tell if it does have a lwp switch inside( helps me speed up on faults

combis that dont have low water pressure switch will use the overheat stat to protect the boiler? correct?

thank you

 

[transam]

Some combi's , do not have a low water pressure switch , as such , they use a primary flow switch , which sense's water flow , e.g pump run's , water present , flow switch make's ignition commence's ect ect , alot of the Biasi boiler's use this method , some of the Halstead's , Baxi , ect ect !!