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Co2 Detector White Wall for Lennox Part# 77N39

Existing reviews

Compatibility Feedback

Fitment on our appliance was accurate while replacing the old component because the appliance suddenly stopped working properly. Noise issue disappeared after replacement.

From: Guest | Date: 10/19/2025 9:36 AM

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Repair Outcome

After dealing with a situation where the older unit needed replacement part, we installed this replacement part. Appliance has been running normally since then.

From: Guest | Date: 1/27/2026 8:36 AM

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