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What type of switch is a limit switch and what should it read when working properly?

Normally closed switch and should read o ohms when working properly.

What are the 5 functions of a control board ?


1)purge cycle for 8 seconds roughly2)opens gas valve3)sends spark or ignition 4)sense flame5)time delay built into board post 2005

What does a thermometer do ?

Measures intensity of heat