I have a Lennox HS29-024-2P Central Air Unit. All of a sudden it just stopped working. Both the Fan and compressor do not start and I don’t hear any humming. When standing next to it I can hear and see the contactor click and move when the thermostat is turned on. I don’t hear anything else. I tried manually pressing the contactor with a stick and it doesn’t do anything. I’m hearing many people talk about replacing the Dual Capacitor. Visually the Dual Capacitor doesn’t look like it’s bulging but it’s slightly rusty. The start capacitor however does look bad, there is white colored stuff seeping out of it. I also verified the fan wasn’t stuck as it turns freely. I’m thinking I should replace the start capacitor since it’s not very expensive. Should I also replace the Dual Capacitor? Any Suggestions would be greatly appreciated.