How much can it cost to fix an E6 error on a TCL inverter AC?

The cost to repair an E6 error varies greatly depending on the cause. Simple fixes like replacing a damaged wire might be inexpensive. Replacing a circuit board could be more costly, and a technician's labor charges also factor in. Expect to pay anywhere from a small amount up to a few hundred dollars or more. It's best to have a technician diagnose the issue.