F02 Fault Code for Tanks: Top Temperature Sensor Failure

[HTP]

This display indicates that the top temperature sensor of the tank has failed. This code indicates a serious safety issue by the red fault light and the word LOCKOUT flashing on the display. The unit will not restart until a technician replaces the sensor and resets the unit. During this lockout fault, the circulator pump will be on as indicated on the second line of the display.