My Lennox G24M stop working. Service guy came; tightened the harness to the control board and charged me $125. It worked for 2 days and stopped again. I found out if I plug and unplug the unit several times, it will work for a few days. Two weeks later, the plug and unplug trick can only make the G24M work for 15 mins only.
The service guy suggest to replace the control board ofr $540.