Tap on the pressure switch to possibly reset the switch to normal off position, not too hard. Check the small hose going to switch for any moisture or a blockage. Inspect your air filter and make sure it is clean. Check for a blockage in any of the condensate hoses or pump. And most importantly, check both air intake and exhaust pipes for any blockage or water that may be restricting the pipes. You can test the pressure switch by attaching a jumper wire to both leads when the inducer blower starts up. If unit fires, replace switch only after you have inspected all other items i mentioned.
Answers & Comments
Tap on the pressure switch to possibly reset the switch to normal off position, not too hard. Check the small hose going to switch for any moisture or a blockage. Inspect your air filter and make sure it is clean. Check for a blockage in any of the condensate hoses or pump. And most importantly, check both air intake and exhaust pipes for any blockage or water that may be restricting the pipes. You can test the pressure switch by attaching a jumper wire to both leads when the inducer blower starts up. If unit fires, replace switch only after you have inspected all other items i mentioned.