104
Failure code
Outdoor
digital display
tube: 33-0, 2, 3
Indoor wired
controller: 21
Indoor unit LED status
LED5 Failure description:
AT24C04 EEPROM communication failure
AT24C04 EEPROM data check failure
IM EEPROM data or communication failure
20 times
Outdoor unit LED status
LED1 LED2
Normal Normal
1. Model Diagnosis and troubleshooting
MRV 5-HR series
DiagnosisT roubleshooting
2. Abnormity detection method
◆
Incorrect EEPROM data.
conditions
EEPROM communication
error; EEPROM data check
error (model ID, checksum,
etc.); EEPROM data logic error
(wider data range, wrong order,
etc.)
4. Possible causes
◆
EEPROM is an old version,
while the program is a new
version.
Tu rn B M 1_1 and M 1_2 t o
"OFF",energize again, and then
check if the failure is cleared.
Replace EE.
Y
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