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Lennox 13ACD-048 Furnace Door Switch
The job of the furnace door switch inhibits the draft inducer and ignition sequence being triggered to start so as to avoid injuries. You should really have it exchanged for a new one as soon as you can if you see that it is broken.
Indications your safety switch on the furnace door will die soon
- The whole system will not start whether the door is off or on
- The switch has been eroded
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