ps = pressure switch. This has to make up b-4 firing. There is a hose that comes off the vent motor & connects to the ps.. HSI = hot surface ignitor. It glows red & ignites the gas as it comes out of the burners or pilot assy.
O' I'm sorry...you have the dumb valve..It can be checked.. I just don't feel comfortable telling you the easy way check them because of FIRE hazard due to your experence level..
You may need to call a pro
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