It is located in my attic and is horazontally mounted. I can hear and see the firing spark. I can see a pilot flame light up for a few seconds and then it goes out. I am not sure how to test or even what to test. I don't know what it is that is suppose to turn off the sparker and keep the gas flowing to the pilot.
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Re: Carrier Forced air furnace will not ignit.
Skeeter is prob right your flame sensor is bad.. clean it or buy a new one, give your supplyer model number or bring it in... take a pic before disconnecting it.. If it fixes the problem, skeeter gets credit.. Thanks
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www.fixya.com/support/t15727344-install_spark_ignitor_in_gas_furnace Jan 8, 2013 - How do I connect the high voltage wire to the Model 990-516 spark - Air ... SOURCE: Goodman furnace wont light, ignitor suspected. Notice.
observe the sequence of operation. stat calls for heat and sends a signal, to furnace. check for 24 volts to common and white wire at furnace.first the forced draft motor starts and should have 120 volts to the plug it attaches to. after forced draft motor starts the pressure or vacuum switch closes should show no 24 volt when checked across terminals. shortly after the ignitor glows and shortly after click the main gas valve opens and main burners fire. shortly after the indoor fan comes on and hot air blows into the ductwork. follow the chain of events to see what doesnt happen and it is a clue to whats broke. maybe start by switching fan switch on stat to on. if fan comes on you have high and low voltage thereby eliminating the stat power and transformer as a problem. if you can see the ignitor look for it to be cracked . look close dont touch any part of it .it is powered by 120 volts when energized from board. dont forget when you take the door off there is no power to the furnace so be prepared to tape the safety switch closed when you are diagnosing.
Try to bypass the connection of the pressure switch to confirm if the pressure switch is really bad, and reset the unit. Monitor your pressure to be sure that its normal and not the cause of tripping your pressure switch.