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Lights flashing, no go

Hi I have a Fujitsu wall mounted aircon unit. That has stopped working. I have switched the unit off both by the remote and at the circuit breaker and have had no joy in getting it working. I am getting 10 flashing green and one red flash on the wall display itself. Can I please have a rough estimate at what this problem could be and how much it would be to fix. Photo of model attached