Lennox Furnace Error Code E300
Rollout switch open — the furnace has gotten too hot and the emergency shutoff switch has triggered.
⚠️ Symptoms You'll Notice
- • Furnace shuts down suddenly
- • Smell of hot air or burning
- • System won't restart
- • No heat
What Causes Error Code E300?
🔧 DIY Troubleshooting Steps
- 1 Replace air filter immediately
- 2 Check all return air vents are fully open
- 3 Let furnace cool for several hours
- 4 Try resetting the rollout switch if accessible
📞 When to Call a Professional
If furnace keeps triggering rollout switch, professional service is needed.
Estimated repair cost in Albuquerque: $150–$500
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Frequently Asked Questions
What does Lennox Furnace error code E300 mean? ▼
Rollout switch open — the furnace has gotten too hot and the emergency shutoff switch has triggered.
How much does it cost to fix error code E300 in Albuquerque? ▼
Typical repair costs in Albuquerque for Lennox Furnace error code E300 range from $150–$500. If furnace keeps triggering rollout switch, professional service is needed.
Can I fix Lennox error code E300 myself? ▼
Some basic troubleshooting is safe to try: Replace air filter immediately. Check all return air vents are fully open. If furnace keeps triggering rollout switch, professional service is needed.
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