Microprocessor Lockup Problems
The microprocessor is the “brains” of the controller. Occasionally, due to electrical problems, the microprocessor will freeze all of its functions. The symptoms of this are: Display blank, (the display does not show any information) or Frozen display, (the display shows erratic information that cannot be cleared or changed from the keypad) and The controller will not perform any of its programmed functions.
If the following steps are taken, the microprocessor will usually resume its normal functions. It will be necessary to completely power down the controller.
**Note: This process will delete your existing program!
Primary power - It is necessary to disconnect the controller from its primary electrical source either by unplugging it from the outlet or by turning off the appropriate circuit breaker in the electrical panel
Battery backup - Remove the battery from the controller. The purpose of the battery is to maintain the information inside of the microprocessor in the event of a primary power failure. By removing the battery the microprocessor is allowed to reset itself to its normal condition.
3. Wait - Maintain this power down condition for 5 minutes to be certain the microprocessor will reset itself.
Primary power - Reconnect the primary power to the controller.
Function check - The display should now show 12:00 A.M. Set the time and day to the current setting. Using the manual controller function, turn on several stations and observe that they operate properly.
If the controller now operates properly re-enter your original program and continue on to step 6. If controller still will not perform correctly it will need to be repaired by a qualified facility.
6. Battery replacement - If the controller uses an alkaline battery, it is recommended that it be replaced with a new one at this time. (See section to determine if your model controller uses alkaline or NICAD batteries.) Reinstall the correct battery in the controller and perform a final resistance test to ensure proper operation. This procedure will normally resolve approximately 30% of the solid state “failures”.