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Air Pressure Switch Clarification

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Desperate_Dan

Desperate_Dan

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Hello, I'm trying to clarify the exact role of the air pressure switch as I seem to be getting different information, specifically around the order of operation. Does the fan need to run in order to activate the switch, does the information get passed to the PCB in a certain order or is it simultaneous? I suspect my APS may be faulty, it has resistance across it, but I'm not sure what else to look out for.
 
Gas safe engy required as it's in the combustion chamber
 
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