Question about Goodman GMS90703BXA Heater
Do not assume that the pressure switch is bad nor the vent motor. The first thing to check is the vacuum hose from the pressure switch to the vent motor. Sometimes they get moisture in them and sometimes they get clogged in the start tube on the vent motor. Take a small needle or paper clip and clean out the start tube on the vent motor. Check the hose for dry rotting or leaks. Cut the ends back about an 1/2" if you have enough hose extra and then re-connect. Next step is to check your flue pipe for a restriction like a birds nest or a wasp nest in the outside termination point. Then to eliminate the vent motor from the equation, take the vacuum hose off the vent motor start tube and with the furnace calling for heat , **** on the hose to keep a constant vacuum on the pressure switch. Watch the ignitor glow or spark ingition start to spark. make sure it lights the burner runners and all burners are lite. usually the ignitor is on the first burner and then there is a flame sensor on the last burner. If the flame does not ignite to the last burner the flame senor will kick tell the control board to turn off the gas valve and shut down. If this happens pull the flame senor out with a 5/16" nut drive and clean lightly with sand paper and re-install it. Start the process over and you should have sucessfully fixed your furnace. If the constant vacuum does not bring on the ingnitor replace the pressure switch.
Posted on Nov 19, 2010
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Posted on Jan 02, 2017
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