Indoor Eeprom Abnormal (Model No.) - Fujitsu ASU9RL Service Instruction

Trouble shooting 9
INDOOR UNIT Error Method:
Indoor EEPROM abnormal
(Model No.)
Detective Actuators:
Indoor Unit Controller PCB circuit
Forecast of Cause:
1. External cause 2. Defective connection of electric components 3. Controller PCB failure
Check Point 1-1 : Reset Power Supply and operate
Does Error indication show again?
YES YES
Check Point 2 :
Check Indoor Unit electric components
Check all connectors.
(loose connector or incorrect wiring)
Check any shortage or corrosion on PCB.
Check Point 3 : Replace Controller PCB
Change Controller PCB.
Indicate or Display:
Indicate or Display:
Outdoor Unit : No indication
Indoor Unit : LED concurrently blinking
ERROR CODE : [E : 11]
Detective details:
When the model information being read from EEPROM has
an apparent error.
NO
Check Point 1-2 :
Check external cause at Indoor and Outdoor
(Voltage drop or Noise)
Instant drop : Check if there is a large load electric apparatus
Momentary power failure : Check if there is a defective contact
Noise : Check if there is any equipment causing harmonic
wave near electric line.(Neon bulb or electric
equipment that may cause harmonic wave)
Check the complete insulation of grounding.
Note : EEPROM
EEPROM(Electronically Erasable and
Programmable Read Only Memory) is a non-
volatile memory which keeps memorized
information even if power is turned off. It can
change the contents electronically.
To change the contents, it uses higher
voltage than normal, and it can not change a
partial contents. (Rewriting shall be done
upon erasing the all contents.)
There is a limit in a number of rewriting.
06-13
in the same circuit.
or leak current in the power supply
circuit.