Lg Ch 73 Error -

This is less common, but some LG models use a "low pressure protection" that, if triggered repeatedly, can cause the outdoor unit to shut down and fail to respond, leading to a CH 73 misinterpretation.

If the outdoor unit is receiving erratic voltage (below 187V or above 253V), its logic board may brown out, reset continuously, and fail to respond. Dedicated circuits with loose neutrals are a common culprit. lg ch 73 error

For official support, you can contact LG Customer Care or find a certified technician to avoid voiding your warranty. This is less common, but some LG models

In LG’s proprietary diagnostic language, translates to "Communication Error between Indoor and Outdoor Units (Communication Wiring Fault)." For official support, you can contact LG Customer

Understanding the root cause is the first step toward a permanent fix. The most frequent culprits include:

: In some cases, it can also signal a communication breakdown between the indoor and outdoor units due to faulty wiring or a control board malfunction. Troubleshooting and Fixes