E0
Tosot
Indoor Unit EEPROM / Main PCB Communication Fault
Indoor unit will not run, display shows E0 shortly after power-up
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Corrupted indoor PCB EEPROM data, Loose or oxidized PCB connectors, Failed indoor main control board, Voltage spike damage to control circuit
How to Fix / Troubleshooting
Safety first: Turn off the breaker to the indoor unit and verify power is off before removing any covers.
- Power reset: Turn the Tosot air conditioner OFF with the remote, then switch OFF the dedicated breaker for 5–10 minutes. Restore power and test. Sometimes E0 clears after a full reset.
- Inspect indoor PCB connections: Remove the front panel and access the control box. Check all low-voltage harnesses going to the main PCB and EEPROM daughter board (if present). Reseat each connector firmly and look for corrosion or burnt spots.
- Check for signs of surge damage: Look for darkened areas, swollen capacitors, or burnt smell on the indoor PCB. If present, the board is likely defective.
- If E0 persists: The indoor main control board (with EEPROM) is likely faulty and should be replaced with the exact Tosot part number specified for your model.
Warning: Do not attempt component-level board repair unless you are trained in electronics. Replace the entire PCB assembly.
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Repair Difficulty
Hard
4/5
Required Part
Indoor Main Control Board (PCB with EEPROM)
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