SOURCE: furnace burner ignites then goes out
Sound like a thermocouple, or flame sensor.
If it has flame sensor make sure you check micro amps to verify operation, because it might be the board that controls the sensor.
SOURCE: 16 year old Heil 75K btu furnace, some times does not ignite.
recommend getting a carbon monoxide indictor or having some one test it. with it being over 15 yrs old if checks good replace ignitor assy should fix it ok
SOURCE: how do connect the wires to a programmable
Your best to get the instructions from the thermostat, there are so many combinations.
SOURCE: heil 75kbtu gas furnace 80% efficiency installed
if it has a pilot, you can follow the pilot tube from the gas valve back to the burner assembly and find it. It may not have one and if this is the case, the air flow switch is supposed to close when the inducer fan comes on . If the flue is clogged, condensation in the bottom of inducer fan(would hear cracking). then after the draft safety switch is closed,the gas vavle will get 24 volts and allow the gas valve to open
SOURCE: 16 yr old heil furnace sometime lights on 1st
The air intake may need to be adjusted or check the gas valve or if it is oil check your cad cell it may not be registering your flame and needs to be replaced that is normally pretty cheap. good luck
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