Lennox
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✅ Safe to Use
Lennox - Error Code 242
Lennox Heat Pump error code 242: Draft pressure switch failed closed.
Is it safe?
✅ Safe temporarily
Safe to leave off. Fix soon — water backup can cause mold or floor damage.
Can I fix it?
DIY Possible
Tools: Screwdriver set, Bucket, Wet/dry vacuum
Repair cost
DIY: $0–$150 (pump or hose)
Pro: $100–$300
⏱ 20–45 min
What Does Error Code 242 Mean?
Lennox Heat Pump error code 242: Draft pressure switch failed closed.
Part that typically fails: Drain pump / drain hose / filter
Safe to leave off. Fix soon — water backup can cause mold or floor damage.
Symptoms You May Notice
- ⚠️ No heating in winter or cooling in summer
- ⚠️ System short-cycles
- ⚠️ Ice on outdoor unit in cooling mode
How to Fix It Yourself
- 1 Check your owner's manual for model-specific guidance on error code reset procedures
- 2 Contact a licensed HVAC technician — refrigerant handling requires EPA 608 certification
- 3 If the error persists after reset and basic checks, contact a qualified technician
🛠️ Tools needed: Screwdriver set, Bucket, Wet/dry vacuum
· Time: 20–45 min
⚡ Quick tip: Always try a full power reset first — turn the unit off at the breaker, wait 30 seconds, restore power.
Frequently Asked Questions
What does Lennox Heat Pump error code 242 mean? ▼
Error code 242 on a Lennox heat pump indicates: Draft pressure switch failed closed. The unit has detected this condition and has limited or stopped operation to prevent further damage.
How do I fix Lennox Heat Pump error code 242? ▼
Start by powering the unit off for 30 seconds and restarting. If error 242 returns, the underlying cause (draft pressure switch failed closed) needs to be addressed. Check wiring connections and filters first before replacing components.
Is Lennox error code 242 serious? ▼
It depends on the root cause. Some 242 errors resolve with a reset. Others indicate a failed component that requires professional repair. Don't continue operating with this error — it can lead to further damage.