I have a G24 Furnace-A/C. I found the original OMRON relays through ALLIED ELECTRONICS. $3.50 each as opposed to $400 for a whole new control board. Just read the Mfr's relay model number off to the ALLIED operator and they will send you some with a MasterCard payment. They have a form/fit/function replacement too. Don't pay LENNOX 100s of dollars for a relay !