Carrier Furnace Error Code 31
Pressure switch or blocked flue — the furnace detects a blockage in the exhaust vent or the pressure switch has failed, preventing safe ignition.
⚠️ Symptoms You'll Notice
- • Furnace won't ignite
- • Blower runs but no heat
- • LED flashing 3-1 pattern
- • Furnace shuts down after startup
What Causes Error Code 31?
🔧 DIY Troubleshooting Steps
- 1 Check the exhaust pipe outside for blockages (bird nests, ice, debris)
- 2 Verify condensate drain is clear and not frozen
- 3 Check the intake pipe if your furnace has one for restrictions
- 4 Listen for inducer motor spinning when heat is called
📞 When to Call a Professional
If the vent is clear and the drain is unclogged, the pressure switch or inducer motor likely needs replacement — not a DIY repair.
Estimated repair cost in Albuquerque: $150–$450
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Frequently Asked Questions
What does Carrier Furnace error code 31 mean? ▼
Pressure switch or blocked flue — the furnace detects a blockage in the exhaust vent or the pressure switch has failed, preventing safe ignition.
How much does it cost to fix error code 31 in Albuquerque? ▼
Typical repair costs in Albuquerque for Carrier Furnace error code 31 range from $150–$450. If the vent is clear and the drain is unclogged, the pressure switch or inducer motor likely needs replacement — not a DIY repair.
Can I fix Carrier error code 31 myself? ▼
Some basic troubleshooting is safe to try: Check the exhaust pipe outside for blockages (bird nests, ice, debris). Verify condensate drain is clear and not frozen. If the vent is clear and the drain is unclogged, the pressure switch or inducer motor likely needs replacement — not a DIY repair.
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