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75 gallon direct vent water heater

plumbbob Member Posts: 19
installed brand new direct vent natural gas water heater that keeps shutting off after 10 seconds,if i remove hose from inducer to pressure switch it runs no problem so i check intake and exhaust no obstructions i removed both intake and exhaust from tank same problem.so now i dig a little deeper i put manometer in series between both pressure switches and its on the money,i tried adjusting the pressure switch and no help i also changed out both switches and its still doing the same thing,any help would be appreciated


  • Fred
    Fred Member Posts: 8,542
    Is it an AO Smith?
    EBEBRATT-Ed Member Posts: 15,849
    You need to find out which switch is shutting it down. Jump out one switch at a time and see if it runs.

    Make sure to take your jumpers off
  • plumbbob
    plumbbob Member Posts: 19
    pulled tube from power vent to first switch turn on and it runs fine,yes its an a.o. smith