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The old style Honeywell Cad Cell Relay, what does it do? It turn the boiler off if there is not ignition or no flame, this stops the oil burner from pumping all of your oil into a boiler that is not working properly, Press this button only once, if the boiler does not start, something is wrong and each time you press the button you are creating a greater and greater hazard. 

 

Cad Cell Relay

 

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