Indoor unit displays E0 and will not start cooling or heating

Safety first: Turn off the air conditioner using the remote, then switch OFF the circuit breaker or unplug the unit. Wait at least 5 minutes before touching any internal components.

• Step 1 – Power reset: Restore power after 5–10 minutes. Try operating the unit again. Many TCL models will clear transient E0 faults after a full power reset.
• Step 2 – Check indoor front panel and display board: Remove the front cover (for wall split units) and verify the display/indicator board harness is firmly connected to the indoor main PCB. Reseat the connector.
• Step 3 – Inspect wiring harness: Look for pinched, burnt, or loose wires between the display board and the indoor main PCB. Repair or replace damaged harnesses.
• Step 4 – Check for signs of surge damage: Look at the indoor PCB for burn marks, swollen capacitors, or a burnt smell. If present, the board is likely defective.
• Step 5 – Replace indoor PCB: If E0 persists after reset and wiring checks, the indoor main control board (with EEPROM) is likely faulty and should be replaced with the exact TCL part number for your model.

Warning: Do not attempt component-level board repair unless you are qualified. High voltages may remain on capacitors even after power is removed.