Then replace the fuse with the spare fuse supplied on the inside of the face panel, just above the 9-Volt battery. Reconnect power to the controller and reset the time and date. An electrical fault has occurred in the master valve or pump start relay circuit. Identify and repair the fault in the master valve or pump start relay circuit. To verify that the problem has been corrected, manually start a program or run the TEST program.
Display is partially or completely blank.
An electrical surge or lightning strike has damaged the controller's electronics. Turn off the controller and disconnect the 9-Volt battery. Let the controller sit for two or three minutes. Then reconnect the battery and restore power to the controller. Reset the time and date.