lennox g24m3/4-100 gas furnace
Posted 16 January 2008 - 08:12 AM
Posted 17 January 2008 - 09:41 AM
Combustion blower starts(upper left of compartment on upflow)
Ignitor glows (located in front of right burner)
Flame stays on if sensed within 5-7 seconds, Ignitor turns off
45-90 seconds later the main blower starts
Where are you at in this sequence? When is it going off? Is there a diagnostic light flashing on the control board? If so what does the diagnostic chart indicate? What does it do after it "relights & goes off?"
Posted 17 January 2008 - 07:02 PM
Posted 22 January 2008 - 05:34 PM
it is getting the call for heat (from the thermostat). at the control 120v is going in, but at the 3 wires to the blower, it gets 117v(low), 98v (heat), and 63v(cool). is this control panel defective? or is there a sensor or something that may be bad?like i said earlier, i pulled out the blower motor and jumped it with 120v, all 3 speeds work. otherwise with the call for heat the combustion fan goes on, the burners fire up then shut off after about a minute when the blower fan never goes on.
Posted 24 January 2008 - 01:35 PM
Can you post a picture of the control and how it is wired now? Or do you know the part number?
Is this the control?
Posted 24 January 2008 - 05:18 PM
thanks for the input about the voltage ratings on the 3 control plugs. thats good to know if i end up fixing another.
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