Lennox HVAC Error Code E47: How to Fix It

Q: What does Lennox error code E47 mean?

It indicates a ground fault in the HVAC system, meaning an electrical component has shorted to ground. This can be caused by a bad compressor, fan motor, wiring, or moisture intrusion.

Q: Can I reset Lennox error code E47?

Yes, you can temporarily clear the error by turning the power off for 5 minutes and turning it back on. However, if the ground fault is still present, the error will return. The underlying issue must be fixed first.

Q: How dangerous is a ground fault in an HVAC system?

Very dangerous. Ground faults can cause electric shock, damage components, or even start a fire. Always turn power off before inspecting and consider calling a professional if unsure.

Q: Will a faulty capacitor cause error E47?

Yes, a capacitor that has internal leakage to ground can trigger a ground fault. It's one of the common components to check during troubleshooting.

Q: Do I need to replace the entire outdoor unit if the compressor is bad?

Not necessarily. The compressor can sometimes be replaced individually, but due to cost and labor, it's often more economical to replace the entire outdoor unit. Consult an HVAC professional for a cost-benefit analysis.

Abstract

Error code E47 on Lennox HVAC systems means a ground fault has been detected, typically indicating an electrical short or moisture issue. This is a serious problem that can damage components or pose a safety risk, so it must be addressed promptly. Follow the troubleshooting steps below, but always prioritize safety.