A controller with a partial or blank display usually has damage to an electronic component on the internal circuit board. Normally this type of damage cannot be repaired. If the controller was installed outside be sure that the door remains closed completely when left unattended. Moisture intrusion is one of the more common reasons this problem may occur.
On most Hunter controller's a 9 volt battery can be installed in the back of the face panel. A working face panel will display a NO or NO AC message after a fresh 9 volt battery is installed.
Other things to check are:
-power to the outlet
-is the breaker tripped
-is the controller plugged in
-If the transformer is hot to the touch its working harder then normal to transform power (110 to 24VAC), this usually means the transformer is about to go out.
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