Have HVAC Questions? Ask an HVAC Expert for Answers
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Have you checked the port where the tube connects, use a small paperclip or wire to make sure the port is clear often they get clogged up and that is what is causing that code.
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If you do not feel a light suction off the nipple itself when the inducer fan is running I would say something is blocked in the exhaust tube or check the condensate drain line for a blockage.
Pull the fan out and check it out, but put the condensate hose back on when trying it as it needs to be in place for proper vacuum.
ok sounds good
You could have a restriction on the exchanger? This would cause no suction on the port. Is the condensate line off the exchanger all clear?
Other than the inducer not running to speed there would have to be a blockage in the unit. Now the suction is very very light so are you certain there is no suction? Make sure the rubber tube is not cracked either.
The exhaust blower is drafting air through the exchanger and burners so if the heat exchanger is blocked that will cause no vacuum on that port like a clogged vacuum filter. If you are certain everything is clear you may have to have the exchanger scoped out by an HVAC company to see if it is blocked up.