Rheem HVAC Error Code 72: How to Fix It

Q: What causes Rheem error code 72?

Error code 72 is caused by a short circuit in the igniter wiring, a faulty igniter element, damaged wiring insulation, loose ground connections, or a defective control board sending incorrect signals to the igniter circuit.

Q: Is it safe to reset Rheem error code 72?

No, you should not simply reset error code 72. This error indicates a potentially dangerous electrical short that must be diagnosed and repaired before operating the furnace. Ignoring it could cause equipment damage or safety hazards.

Q: How much does it cost to fix Rheem error code 72?

Repair costs typically range from $150-500 depending on the required parts. A new igniter costs $50-150, wiring repairs cost $100-200, and control board replacement can cost $200-400 plus labor if you hire a technician.

Q: Can I replace a Rheem furnace igniter myself?

While possible for experienced DIYers, igniter replacement involves working with electrical circuits and gas appliances. Many manufacturers require professional installation to maintain warranty coverage. Check your warranty terms before attempting DIY repairs.

Q: How long do Rheem furnace igniters last?

Rheem furnace igniters typically last 3-7 years depending on usage and operating conditions. Signs of a failing igniter include slow heating, frequent cycling, visible cracks in the igniter element, or error codes like code 72.

Abstract

Rheem error code 72 indicates an igniter circuit short to ground in your HVAC system. This serious electrical issue prevents your furnace from lighting properly and requires immediate attention to avoid safety hazards.