C2-770 C2-4000 C2-5000 series fault codes

1 = A/D convertor I2C communication error
2 = Video decoder 1 I2C communication error
4 = Video decoder 2 I2C communication error
8 = Genlock video decoder I2C communication error
16 = Clock generator I2C communication error
32 = Video encoder I2C communication error
64 = PLL I2C communication error
128 = (not used)
256 = PLD not running
512 = Flash memory communication error
1024 = Fan speed error
2048 = Internal temperature too low
4096 = Internal temperature too high
8192 = Flash memory page overflow
16384 = Front panel data checksum error
32768 = (not used)
65536 = Main board data checksum error

Fault condition 1024 implies that the integral fan is running either too fast or too slow, compared to the speed the scaler is expecting it to run at. This can sometimes happen if you have something blocking the ventilation grills. Also ensure you have the latest firmware running, as version 88 can cause erroneous code 1024 errors.