Fan Electrical fault, or not connected..
Try the following:
1. Switch the Power OFF from the back of the Printer and disconnect the Power cord. Reconnect the power cord and power On the Printer.
2. Check that the Aerosol Fan cable is not damaged and is correctly connected to the PrintMech PCA.
3. Replace the Aerosol Fan Assembly.
4. If the System Error continues, replace the PrintMech PCA.