Read also: Carrier Furnace Code 31 [Solved] Obstructed pressure tubings. Ensure the tubings connecting the pressure switches are not is not kinked, deteriorated or doesn't have water in it. Bryant Furnace Code 31 [Fixed] 4. Many times you may also have clogged ports (where vacuum tubings attach the switch.).. Struggling with a Bryant furnace displaying code 31? This article demystifies the pressure switch issue, providing detailed troubleshooting steps and preventative maintenance tips. Discover how to interpret various diagnostic codes, check for blockages, and ensure optimal furnace performance. With expert advice on resolving issues and when to consult a certified HVAC technician, regain your.
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Replace the air filter; Check that exterior vents are not blocked ⚠️ If the problem persists, call a professional—flame roll-out is a serious safety hazard.; 4. Code 31 - Pressure Switch Did Not Close. What it means: The furnace isn't getting proper airflow during startup. 🔍 Possible causes: Blocked vent pipe, faulty inducer motor, or clogged drain line. 🛠️ Homeowner fix:. Please help. My Bryant plus 90 furnace (model 350 MAV) goes through the ignition cycle, but does not light. It provides a fault 31 code. I have verified operation of pressure switch based on directions in my owners manual. I hace cleaned the ignitor rod, vacuumed the burner ports, and cleared all obstructions and vent restrictions.