Model # g20-q314-100-1
Serial # 5890A05729

Need a control board for this furnace. The Q314 in the Model# may be Q3/4. The auto setting on the thermostat will not activate the blower fan. I had an HVAC guy come out and diagnose and this is what he told me. Is a Lennox part the only way to go? Can it be gotten from another source? Are there any used parts out there on the market? Brother can you spare a circuit board? I don't want to break anything but there is a limit sensor that someone suggested that I clean because it may get hot and limit out so no fan. Is this something that is pretty straightforward? The fan is running 24/7 at this point and the heat is staying a reasonable level but I want to get it back to normal function. I appreciate any and all help. Thanks.

Frank

If memory serves me... what was I saying? Oh yeah, blower control is a timed function of the circuit board and starts when pilot is proven. Having said that, sounds like a bad board. Sorry. P.S. It's 3/4

Lennox board is the way to go. You could use a universal White Rodgers/Honeywell but you better pay a pro to change it over.

Quote:

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Originally Posted by hvac1000

Lennox board is the way to go.

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*sigh* Unfortunately.

Wait a minute, maybe a paper clip...

I'm pretty sure paper clips were OEM on all Lennox.

Yes, they proved to be more cost-effective than the previously-used diaper pins.

I am kind of having the same issue the unit fires up but the blower doesn't come on I have already changed out the blower ckt board but still no blower. I need help please... would the ignition modual make it turn the fan on.
M/n-G20Q3E-75-1
S/N-5891A00664