Lennox Furnace Error Code 3 Flashes
Pressure switch fault — the pressure switch is faulty or not responding properly.
⚠️ Symptoms You'll Notice
- • Furnace won't ignite
- • No draft detection
- • System locked out
- • No heat
What Causes Error Code 3?
🔧 DIY Troubleshooting Steps
- 1 Check pressure switch tubing for damage or blockage
- 2 Verify inducer motor is attempting to run
- 3 Check exhaust vent for blockages
- 4 Reset furnace
📞 When to Call a Professional
Pressure switch replacement is necessary.
Estimated repair cost in Albuquerque: $150–$350
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Frequently Asked Questions
What does Lennox Furnace error code 3 mean? ▼
Pressure switch fault — the pressure switch is faulty or not responding properly.
How much does it cost to fix error code 3 in Albuquerque? ▼
Typical repair costs in Albuquerque for Lennox Furnace error code 3 range from $150–$350. Pressure switch replacement is necessary.
Can I fix Lennox error code 3 myself? ▼
Some basic troubleshooting is safe to try: Check pressure switch tubing for damage or blockage. Verify inducer motor is attempting to run. Pressure switch replacement is necessary.
Other Lennox Furnace Error Codes
Error Codes from Other Brands
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