What is the difference between an E227 and an E228 error code on a Lennox furnace?

By: USER2951
27 Agustus 2025 Support 5 minutes
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Grade: Education Subject: Support
What is the difference between an E227 and an E228 error code on a Lennox furnace?
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Both E227 and E228 relate to communication issues. E227 specifically indicates a *lack of response* from the outdoor unit. E228, on the other hand, indicates a *shorted* communication wire between the indoor and outdoor units. The troubleshooting steps differ slightly based on which error code is present.
Answered on 27 Agustus 2025

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