Haier MRV 5-RC VP1-112B Service Manual page 189

Failure code
Indoor unit LED status
Outdoor
digital display
tube: 33-0, 2, 3
Indoor wired
Outdoor unit LED status
controller: 21
1. Model
MRV 5-RC series
2. Abnormity detection method
◆ Incorrect EEPROM data.
3. Abnormity confirmation
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.
Normal
Diagnosis and troubleshooting
Diagnosis
Tu r n B M 1 _ 1 a n d M 1 _ 2 t o
"OFF",energize again, and then
check if the failure is cleared.
Replace EE.
LED5 Failure description:
AT24C04 EEPROM communication failure
AT24C04 EEPROM data check failure
20 times
IM EEPROM data or communication failure
LED1 LED2
Normal
Y
186
Troubleshooting