pressure is checked in inches of water columns, wc. a magnahelic or a manometer is what is used to check wc. pressure switches require a certain wc to pull it closed. The required wc may or may not be printed on the switch itself. let's say yours needs .4" wc to close it but the draft inducer, checked by way of manometer, is only offering .2" wc. then the draft inducer needs to be changed. If that was the case the inducer would also be pulling a different, more than likely higher, amperage.
Next time your furnace acts up and with the light blinking pull the hose off at the inducer and continually suck through it. Yes, you can keep suctionon the hose and breathe at the same time as you will need to continually have suction on the hose, closing and keeping closed the pressure switch.
This will work, I gaurantee it but the question still remains, is it the pressure switch or the inducer? I guess we'll find out when you get the new switch in!
Linear Mode
