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home Fix label Heating label_important Home Heating Systems category Economy

How can I isolate air pressure switch?

I have an Economy 50F boiler which will not fire. I think it may be the air pressure switch but in order to isolate the switch I need to know which two wires to pair. There are three wires red, yellow and black which come from the switch to the board.
Dave, January 2009
home Fix label Heating label_important Home Heating Systems category Economydone
Don't, use a multimeter to determine if the switch is switching or not. You should have 240v at the normally open connector when the fan runs.

Iain, January 2009
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