High Temperature Error
The internal temperature of the machine has risen above that at which it can operate.
This message appears when the temperature rises to 46°C (114.8°F) or higher during startup or to 51°C (123.8°F) or higher during operation (when recovering from sleep mode). Operation cannot be continued. Turn off the sub power. Bring the installed location to a temperature at which operation is possible (20 to 32°C [68 to 90°F]), and then turn on the power.