Real Plumbing Help Plumbing and Heating Answers

This is the old defective Aquastat relay. The relay sticks and causes the boiler not to run.
 to get this off you have to loosen the screw/nut on the top see the next picture. I had to pull the top or the boiler Jacket over to get to the screw.

 

Peerless gas furnace

 

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