Tag: error-codes
All the articles with the tag "error-codes".
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How to Clean an HVAC Flame Sensor - Step-by-Step Guide
Step-by-step guide to cleaning a gas furnace flame sensor. Includes how to test with a microamp meter, cleaning with emery cloth, and when to replace the rod entirely.
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HVAC Pressure Switch Fault - Diagnosis and Fix Guide
Diagnose and fix pressure switch faults on gas furnaces. Covers draft inducer diagnosis, condensate drain blockage, cracked pressure switch hoses, and stuck switches.
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Lennox Merit Series Furnace Error Codes - What It Means and How to Fix It
Complete Lennox Merit series furnace flash code reference covering all LED blink patterns, fault causes, and step-by-step fixes for the ML193, ML180, and related models.
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Lennox Merit Series Furnace Error Codes (2024-2025) - LED Flash Code Guide
Lennox Merit series 2024-2025 furnace LED flash codes decoded. What 1 through 9 flashes mean, how to fix each fault, and when to call a tech.