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:D finally!!! now.... last question i promise!! :P As stated, the pilot solenoid has to be enrgised to allow the main burner to open - how does it do this/how are they connected... Thanks to all who have responded to my post. I am grateful to all of you. All the best Pat.

Ok, i get it now (i think)! :D so this is how it works!!!!! ... pilot is permanently lit (from the push button which was pressed when the boiler was first installed). this heats the thermocouple which then holds the solenoid open and keeps allowing gas to flow to the pilot burner...

Sorry, one last point: if the programmer/boiler stat opens/energises the solenoid to the burner, then how does the fail safe device work. ie/ it may open still if/when the pilot goes out which would not be safe ...

Ok. Thanks again for all your excellent help. I am interested in learning about boilers and have learned that there are lots of different types/workings, ie/ some do not have a pilot flame, some have no thermostat and use thermistors instead, modern boilers have a fan and an air pressure...

Thank you for your response. So basically, the boiler thermostat operates the main solenoid, allowing gas to the burner? A lot of GAS sections in plumbing books say that the pilot flame's heat on the thermocuple, allows a small current to energise a solenoid which then opens and allows...

Hello. I found this website by google and would like some help working something out please. I have a POTTERTON FLAMINGO II RS40 boiler. I am trying to work out how it operates - and after reading the manual and some books from my library, still am not 100% sure. Call me sad if you want...