Panasonic U-4LE1E5 Service Manual page 118

4. Mini VRF System Alarm Codes
3. Mini VRF System Alarm Codes
F31 Outdoor Unit Nonvolatile Memory (EEPROM) Error
1. Error Detection Method
It is judged an error based on the criteria listed below.
When power initially turned ON for the first time, nonvolatile memory (EEPROM) is not installed.
•
• Read values after writing onto nonvolatile memory (EEPROM) is inconsisntent.
2. Error Diagnosis
1 PC board
1-1
1-2
1-3
5
Does EEPROM exist on the control PC board?
Is EEPROM installed properly?
(Check: Bent IC pin or incorrect installation, etc.)
Incorrect EEPROM
Replace with correct EEPROM.
5 - 30
Mini VRF SYSTEM
Mini VRF SYSTEM
Trouble Diagnosis
Trouble Diagnosis
Yes 1-2
No Install EEPROM
Yes 1-3
No Correct