Fujitsu AST9LSACW Fault code

[GSK33]

Probably AFM failed, most common fault.
BTW you need to count the flashes, either a specific count if flashing slow, or if flashing really fast, then it's 10Hz and note that

Thanks Paul. The red operation light stays on and the green timer light continually flashes slowly. (green for about a second and off for about a second) No other lights flash or light up.

Indoor unit is AST9LSACW
Outdoor unit is AOT9LSAC

Cheers
Geoff