How do you manually open the heater doors if the switch is broken?

To manually open heater doors when the switch is broken, locate the manual override mechanism, which is often a lever or a pull cord near the heater unit. If no manual mechanism is visible, you may need to access the heater's control panel and gently pry open the door using a flathead screwdriver or similar tool, taking care not to damage any components. Always ensure the heater is turned off and cool before attempting any manual operation. If unsure, consult the heater's manual or a professional for assistance.