Damaged insulation of the wire unit of the temperature sensor (reference 1 image) which measures the temperature of the water cooling block of the red channel. When disconnecting the wire unit (reference 11 image) of the temperature sensor from the Signal backplane the error code is changed to “block red - temperature sensor open”.

1. Repair the insulation of the wire unit using shrink sleeve.

2. If not repairable, replace the whole wire unit and temperature sensor.

Defect temperature sensor on the water cooling block of the red channel. When disconnecting the wire unit of the temperature sensor from the Signal backplane the error code is changed to “block red - temperature sensor open”.

Replace the temperature sensor.