Check the communication cables (inter-unit wiring) between the indoor and outdoor units for loose connections, damage, or corrosion. Check for Obstructions:
Start with the hard reset. Then check the wires. Only then call a technician. And when they arrive, confidently tell them: "It’s a CH 73 – I’ve already checked the fuses and terminals." They will thank you for saving them diagnostic time, and you will likely pay less for the repair. lg ch 73 error
Before you panic and call an expensive repair technician, it is crucial to understand exactly what CH 73 means, why it triggers, and what troubleshooting steps you can safely perform yourself. why it triggers