Trouble shooting 13 E31. 3
INDOOR UNIT Error Method:
Indoor unit Power Frequency
Abnormal
Indicate or Display:
Indoor Unit : Operation LED 3 times Flash, Timer LED 1 Times Flash,
Filter LED Continuous Flash.
Outdoor Unit : E.5 U.1
Error Code : 3 1
Detective Actuators:
Indoor Unit Controller PCB Circuit
Detective details:
When 5 continuous failures occurred at Power frequency test.
Forecast of Cause :
1. Outside cause 2. Installation failure 3. Defective connection of electric components
4. Controller PCB defective
Check Point 2 : Check Installation condition
NO
Check Point 3 : Check connection of electric components
YES
Check Cable/Breaker
Check loose or removed connection
>> If Installation defect is found, correct it by referring
to Installation Manual.
OK
Check power supply voltage (AC198 - 264V between
Indoor unit terminal 1 and 2)
Check connection of Connector (any lose connector or
incorrect wiring)
Check any shortage or corrosion on PCB.
OK
Check Point 1-1 : Reset Power Supply
Does abnormal LED indication show again?
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.
Check Point 4 : Replace Controller PCB
Change Controller PCB and set up the original address.
AC
04-21
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