RHEEM ERROR CODE E4 • TRI-STATE AREA
Rheem Error Code E4: High Temperature Limit
Your Rheem furnace overheated. Learn causes, fixes, and when to call a professional.
Frequently Asked Questions
What is Rheem error code E4?
Rheem error code E4 indicates a high temperature limit fault. The furnace overheated and the safety limit switch opened to prevent damage.
What causes Rheem E4 error?
Common causes include dirty air filters, blocked vents, blower motor issues, or dirty evaporator coils restricting airflow.
How do I fix Rheem E4 error?
Start by checking and replacing your air filter, ensure all vents are open, and verify the blower motor is running. The limit switch usually auto-resets once the furnace cools.
Is E4 error dangerous?
The E4 error is a safety feature protecting your furnace from overheating. However, repeated overheating can damage the heat exchanger.
How do I reset Rheem E4 error?
Turn off power, let the furnace cool for 30 minutes, address airflow issues, then restore power. The limit switch should auto-reset.
Can a dirty filter cause E4?
Yes, dirty filters are the #1 cause of E4 errors. Replace filters every 1-3 months during heating season.
Where is the limit switch on Rheem furnace?
The limit switch is typically mounted on the plenum above the heat exchanger. It's a safety device with temperature-sensing capabilities.
How much does E4 repair cost?
Repair costs vary depending on the issue. A filter replacement is the most affordable fix, while limit switch or blower motor replacement costs more. Contact a professional for diagnosis and pricing.
Why does E4 happen in winter?
Higher heating demand and longer run times expose airflow issues. Filters clog faster during peak heating season.
Who repairs Rheem E4 errors in the tri-state area?
Dimatic Control LLC provides expert Rheem furnace service throughout the tri-state area. Call (908) 249-9701.
Can ductwork cause E4?
Yes, blocked, disconnected, or undersized ductwork restricts airflow and can cause overheating.
Should I bypass the limit switch?
Never bypass a limit switch. It's a critical safety device. If it keeps tripping, fix the underlying airflow problem.
How long until limit switch resets?
Most limit switches auto-reset within 15-30 minutes once temperatures drop. If it doesn't reset, the switch may be faulty.
Can closed vents cause E4?
Yes, closing too many vents creates backpressure, restricting airflow and causing overheating. Keep at least 80% of vents open.
Does Rheem warranty cover E4 repairs?
Rheem warranties cover most parts but labor varies. Check your warranty documentation for specific coverage details.