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A door switch is a safety device that detects whether the access door of your boiler or burner is properly closed. It prevents the system from operating when the door is open, protecting users from potential hazards. If the switch fails, the system may not start or may run unsafely. This replacement switch is a standard spare part for many heating appliances, designed for straightforward installation. During routine boiler maintenance, testing the door switch is important. Replacing a defective switch ensures continued safe operation and compliance with safety standards.