2HUM18HC03/R2(DB)-SM Wiring diagrams
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Domestic air conditioner
7.3.2 EEPROM abnormal
Indoor Display E4: indoor EEPROM error
Indoor display F12: Outdoor EEPROM error ;Outdoor LED1 flash 1 times
Method of The Data detected by the EEPROM are used to determine MCU
Malfunction
Detection
Malfunction when the data of EEPROM is error or the EEPROM is damaged
Decision
Conditions
Supposed Ƶ Faulty EEPROM data
Causes Ƶ Faulty EEPROM
Ƶ Faulty PCB
Troubleshooting * Caution Be sure to turn off power switch before connect or disconnect connector, or parts damage
may be occurred.
7.3.3 Indoor AC fan motor malfunction
Indoor Display
E14
Method of
The rotation speed detected by the Hall IC during fan motor operation is used to
determine
Malfunction
abnormal fan motor operation
Detection
Malfunction
when the detected rotation feedback singal don’t receiced in 2 minutes
Decision
Conditions
Supposed
Ƶ
Operation halt due to breaking of wire inside the fan motor .
Causes
Ƶ
Fan motor overheat protection
Ƶ
Operation halt due to breaking of the fan motor lead wires
Ƶ
Detection error due to faulty indoor unit PCB
Troubleshooting
* Caution
Be sure to turn off power switch before connect or disconnect connector,
Replace the indoor or outdoor mainboard
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