GOODMAN ERROR CODE • TRI-STATE AREA
Goodman Error Code LC: Limit Circuit Fault
Your Goodman furnace has shut down due to overheating. Learn the causes and DIY troubleshooting steps.
What is Goodman Error Code LC?
Goodman error code LC indicates a Limit Circuit Fault. The high temperature limit switch has opened because your furnace is overheating. This critical safety device prevents dangerous temperatures that could damage the heat exchanger or cause fires.
When the limit switch opens, gas flow stops immediately. The blower continues running to cool the heat exchanger. Once temperatures normalize, the switch should auto-reset, allowing the furnace to resume operation.
Quick Troubleshooting
1. Replace Air Filter
The #1 cause of LC. Replace immediately if dirty.
2. Open All Vents
Ensure all supply and return vents are fully open.
3. Wait 15-20 Minutes
Let furnace cool before attempting restart.
4. Restore Power
If LC returns, call for professional service.
Frequently Asked Questions
What is Goodman error code LC?
Goodman error code LC indicates a Limit Circuit Fault. The high temperature limit switch has opened due to the furnace overheating, typically caused by restricted airflow.
What causes Goodman error code LC?
Common causes include dirty air filter, closed or blocked vents, malfunctioning blower motor, dirty evaporator coil, ductwork restrictions, or a faulty limit switch.
How do I fix Goodman error code LC?
Replace the air filter, open all vents, and let the furnace cool 15-20 minutes. The limit switch should auto-reset. If LC returns, professional service is needed.
Is Goodman LC the same as overheating?
Yes, LC means your Goodman furnace overheated. The limit switch opened as a safety measure to prevent heat exchanger damage and fire hazards.
Can I bypass the limit switch?
Never bypass a limit switch. It prevents fire, heat exchanger damage, and carbon monoxide production. Bypassing puts your family at serious risk.
How often should I change filters to prevent LC?
Check filters monthly during heating season. Replace when visibly dirty—typically every 30-90 days for standard 1-inch filters.
Why does my Goodman furnace keep overheating?
Recurring LC indicates chronic airflow problems: dirty coils, weak blower motor, undersized ductwork, or too many closed vents. Professional diagnosis can identify the root cause.
How long does it take to fix Goodman LC?
Repair time depends on the cause. Filter replacement takes just minutes. Limit switch replacement typically takes 30-60 minutes. Blower motor replacement may take 1-2 hours. Coil cleaning takes about an hour.
Can closed vents cause Goodman LC?
Yes, closing too many vents restricts airflow, causing overheating. Keep at least 80% of vents fully open for proper system operation.
What's the difference between GC and LC?
GC is Ignition Failure (can't establish flame). LC is Limit Circuit Fault (overheating). GC is a startup problem; LC occurs during operation due to airflow restriction.
Where is the limit switch on a Goodman furnace?
The limit switch is typically on the plenum above the heat exchanger or on the burner compartment cover. It's a disc-shaped safety device.
Can a dirty coil cause LC?
Yes, a heavily soiled evaporator coil blocks airflow like a clogged filter. If filters are clean but LC persists, the coil may need professional cleaning.
Why does LC happen more in winter?
Higher heating demand means longer run times. Filters clog faster with increased use. Cold weather exposes marginal airflow issues that were fine during milder conditions.
Can a high-MERV filter cause LC?
Yes, MERV 13+ filters restrict more airflow. If LC appeared after changing to a high-MERV filter, try MERV 8-11 unless your system is specifically designed for high filtration.
Who repairs Goodman furnaces with LC in the tri-state area?
Dimatic Control LLC provides expert Goodman furnace service throughout the tri-state area. Our technicians diagnose and repair LC issues with same-day appointments. Call (908) 249-9701.
Need Help with Goodman Error Code LC?
Same-day Goodman furnace repair throughout the tri-state area.
Call 908-249-9701