Panasonic S-45PU1E5 Technical Data & Service Manual page 303

F31 Outdoor unit nonvolatile memory (EEPROM) trouble
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.
•
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Read values after writing onto nonvolatile memory (EEPROM) is inconsisntent.
2. Error Diagnosis
1 PC board
1-1 Does EEPROM exist on the control PC board?
Is EEPROM installed properly?
1-2
(Check: Bent IC pin or incorrect installation, etc.)
Incorrect EEPROM
1-3
Replace with correct EEPROM.
5-31
Yes 1-2
No Install EEPROM
Yes 1-3
No Correct
5