Cause
- Controller Memory Failure
| Components | Troubleshooting | Corrective actions |
|---|---|---|
| Controller | Pressing the ENTER key when “CLEAr” is displayed will result in an attempt to clear the alarm. | If action is successful (all alarms are inactive), alarm 51 will be reset. |
| Power cycle the unit. If the alarm persists, it indicates defective controller memory. | Replace defective controller, refer to Controller Service Section 6.23 | |
