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Can you tell me what symptoms you are experiencing as well as the make and model of your HVAC unit?
The switches should be located on top of the burner box. One switch on each side, just above each burner. I have attached a manual that may help (or you may already have). Each switch should have a button in the middle that may be popped up. Pushing it in will generally reset the switch. Page 6 shows the switch locations and pages 12 and 13 explain resetting the switches. Let me know if you have any questions. Thanks!