frigidaire g6ra120c gas furnace turns on and off several times

Old 02-01-12, 11:29 PM
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frigidaire g6ra120c gas furnace turns on and off several times

I have a frigidaire gas furnace that turns on and off several times and eventually will stay on and blow heat. the furnace will attempt to start, the ignitor will light in several seconds a click occurs and the gas is released and will briefly light only near the ignitor ,gas will then turn off. this will happen several times then eventually the gas will light completely and blow heat. so the sequence is
thermostat request heat
ignitor turns on
clicking noise, gas is released
gas ignites for a brief second then turns off (flame is not near flame sensor)
repeats several times
then fully ignites (near the flame sensor)
blows heat.
system will tuen off when thermostat temp is reached
any info would be helpful-the flame sensor has been replaced
Old 02-02-12, 07:34 AM
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The hot surface ignitor typically has 20-30 seconds to warm up to the point it is whit hot. At that point, the gas should turn on for 3-5 seconds and light off the hot surface ignitor. If the burner flames engulf the flame sensor, the flames should be detected by the circuit board, which will leave the gas on.

It sounds like the gas is staying on for a second or less from your description --- is that right? I'd measure the voltage being applied to the gas valve to see if it is adequate to keep the gas valve open --- it should be at about 24 VAC.

If you are getting that 24 VAC for a second or less, the curcuit board isn't leaving the gas on long enough, and the circuit board is defective and should be replaced.

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