Trouble shooting 70 EJ1. 4
RB UNIT Error Method:
RB Unit transmission PCB2 parallel
communication Error
Indicate or Display:
Indoor Unit : 1st: Operation LED 13 times Flash, Timer LED 1 Times
Flash, Filter LED Continuous Flash.
2nd:Operation LED 1 time Flash, Timer LED 4 Times Flash
Outdoor Unit : E. 1 4.1 / 1 4.2*
Error Code : J 1 / 1 4
RB Unit : Power LED ON, Error LED Continuous Flash
Detective Actuators:
RB Unit Controller PCB Circuit
RB Unit Communication PCB
Detective details:
When Parallel Communication Error (Communication reset occurs continuously
more than specified times) is detected.
Check Point 3 : Replace Communication PCB
Forecast of Cause : 1. Connection failure 2. Outside cause 3. Communication PCB failure 4. Controller PCB defectve
Check Point 1 : Reset Power Supply
Does Error LED indication show again?
Replace Communication PCB.
Check Point 2 : Check RB Unit components
Check if RB Unit Communication PCB is removed.
Check Point 1-2 :
Check outside cause (Voltage drop or noise, etc.)
Instant drop ----- Check if there is a large load electric apparatus
in the same circuit.
Momentary power failure ----- Check if there is a defective
contact or leak current in the
power supply circuit.
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.
NO
* Outdoor unit indicates 1 4.1 or 1 4.2 (No communication from Indoor unit)
Service tool indicates Error 1 4.3 or J 1.1, when the service tool detects No
communication of outdoor unit or the communication Error of RB unit.
04-79
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