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Trouble shooting 11
INDOOR UNIT Error Method:
Communication Error between
Controller PCB and Transmission PCB
Detective Actuators:
Indoor unit Controller PCB circuit
Indoor unit Transmission PCB
Forecast of Cause : 1. Connection failure 2. Outside cause 3. Transmission PCB failure 4. Controller PCB failure
Check Point 1-1 : Reset the power
Does LED error indication reappear?
YES
Check Point 2 : Check Connection
p Check if Indoor Transmission PCB is removed.
OK
Check Point 3 : Replace Transmission PCB
Replace Transmission PCB (If the symptom does not
change, replace Controller PCB and set up the original
address.
Indicate or Display:
Indoor Unit : Operation LED Flash, Timer LED 6 Times Blink
Outdoor Unit : LED1 Flash, LED6
ERROR CODE : E : 21
Detective details:
When Parallel communication error (Transmission reset occurs continuously
more than specified times) is detected.
NO
Check Point 1-2 : Check outside cause such as noise
p Check the complete insulation of the grounding.
p Check if there is any equipment that causes harmonic wave near
the power cable (Neon light bulb or any electronic equipment which
causes harmonic wave).
06-18
Swing LED OFF
1Time Blink
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