What does error code 42 mean on a Lennox Merit series gas furnace and is there a manual override I can use tonight?
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What does error code 42 mean on a Lennox Merit series gas furnace and is there a manual override I can use tonight?
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Lennox Merit gas furnace error code 42 meaning diagnostic code 42 manual Google ↗
site:lennox.com furnace "42" diagnostic code Merit Google ↗
- Lennox MERIT Series Installation Instructions Manual (Page 26 of 39) · manualslib.com
- LENNOX ML296UHV Merit Series Gas Furnace Instruction Manual · device.report
- © 2026 Lennox Industries Inc. · lennox.com
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