Fujitsu Airstage V-II Service Manual page 80

Trouble shooting 11
INDOOR UNIT Error Method:
Indoor Unit Parallel Communication
Error
Detective Actuators:
Indoor unit Controller PCB circuit
Indoor unit Communication PCB
Forecast of Cause : 1. Connection failure 2. Outside cause 3. Communication PCB failure 4. Controller PCB failure
Check Point 1-1 : Reset the power
Does LED error indication reappear?
YES
Check Point 2 : Check Connection
Check if Indoor Communication PCB is removed.
OK
Check Point 3 : Replace Communication PCB
Replace Communication PCB (If the symptom does not
change, replace Controller PCB and set up the original
address. (Refer to 06-03 page Main PCB removal.)
Indicate or Display:
Outdoor Unit : E.5 U.1
Indoor Unit : Operation LED 1 times Flash, Timer LED 6 Times Flash,
Filter LED Continuous Flash.
Error Code : 1 6
Detective details:
When Parallel communication error (Communication reset occurs continuously
more than specified times) is detected.
NO
Check Point 1-2 : Check outside cause such as noise
Check the complete insulation of the grounding.
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).
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