Tag: furnace
All the articles with the tag "furnace".
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Goodman Furnace 3 Flashes — Pressure Switch Open Fix
Goodman furnace 3 slow flashes means pressure switch open. Blocked condensate drain, cracked inducer hose, or failed switch. Step-by-step fix guide.
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Goodman Furnace 4 Flashes — Open High Limit Switch Fix
Goodman furnace 4 slow flashes means the high limit switch is open. Dirty filter causes 80% of cases. Step-by-step diagnosis and fix guide.
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Furnace Filter Size Guide — How to Find the Right Size and MERV Rating
Not sure what furnace filter size you need? This guide shows you how to measure, read the label, understand MERV ratings, and pick the right filter for your system.
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Lennox iComfort Error Code 31 — Pressure Switch Fault Diagnosis and Fix
Lennox iComfort error code 31 means a pressure switch fault. Learn what causes it, how to test the pressure switch and inducer, and which parts to replace.