Power frequency error 1
Branch Box Controller PCB
Indoor Unit : Operation LED 1times Flash, Timer LED 1times Flash,
Economy LED Flashing (0.1s ON / 0.1s OFF)
Outdoor Unit : E. 11. 3 or E. 11. 4
Branch Box : LED401/ 402/ 403/ 404 Lit, LED405 Unlit
Error Code : 11
Trouble shooting 38
Indicate or Display:
Detective Actuators:
Detective details:
Branch Box Error Method:
Forecast of Cause :
YES
NO
OK
When 4 continuous failures occurred at Power frequency test.
(Power supply of Branch Box)
OK
AC
1. Connection failure 2. External cause 3. Controller PCB failure
Check Point 1-1 : Reset the power supply and operate
Does error indication reappear?
Check Point 2 : Check connection
Check Cable/Breaker.
Check loose or removed connection.
>> If there is an abnormal condition, correct it by
referring to Installation Manual or Design &
Technical Manual.
Check Point 3 : Check the voltage of power supply
Check the voltage of power supply
>> Check if AC198V(AC220V-10%) - 264V(AC240V+10%) appears
at Branch Box terminal "Power" L1 - L2.
Check Point 1-2 : Check external cause such as noise
Check if the ground connection is proper.
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).
Check Point 4 : Replace Controller PCB.
If Check Point 1 ~ 3 do not improve the symptom,
replace Controller PCB.
02-54
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