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Carrier 48XP030040300 Furnace Door Switch
A furnace door switch is a safety feature that prevents the draft inducer and gas ignition from turning on so as to avoid injuries. Do not try to fix it, just have it traded for new one ASAP if it is defective.
Some clues your safety switch on the furnace door has little life left
- The whole system does not begin to work even when you close the door
- The switch is fallen off
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