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Lennox CB28UH-024 Furnace Door Switch
The job of the furnace door switch blocks the blower and ignition sequence being triggered to start in order to prevent injury and fire. It is quite important to have it traded for new one immediately if you can, if it is damaged so as to prevent something bad happening.
Some clues your safety switch on the furnace door is dead
- The whole system will not run whether the door is open or closed
- The switch looks as if it has been breaking apart
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