Trouble shooting 85 E39. 3
INDOOR UNIT Error Method:
Indoor Unit Power Supply Error
of AC24V System
Indicate or Display:
Outdoor Unit : E.5 U.1
Error Code : 3 9
Detective Actuators:
Indoor Unit Power Supply PCB Circuit
Indoor Unit Power Trans
Indoor Unit Controller PCB
Detective details:
When the AC voltage of the Power Trans output , Is lower than 24V.
Check Point 2 : Check the connection of terminal
After turning off the power, check & correct of followings.
Check Point 3 : Check the Power Trans and Power Supply PCB
Check terminal voltage of Power Trans and Power Supply PCB connector CN113 (AC24V IN).
If AC 0V, Power Trans is failure
>>Replace Power Trans
OK
Forecast of Cause : 1. Terminal Connection Abnormal 2. Power Supply Abnormal
3. Power Trans
4. Power Supply PCB 5. Controller PCB 6. Cable Connection failure
>>Check the connection of terminal between Power Trans and Power Supply PCB(CN113),
and Check if there is a disconnection or short of the cable.
If AC24V, To the Check Point 4.
Check Point 1 : Check the Power Supply PCB and Controller PCB
Check the connection of connection terminal between Power Supply PCB(CN24) and
Controller PCB(CN114) and check if there is a disconnection or short of the cable.
OK
AC
04-88
+6
Check Point 4 : Replace the Power Supply PCB
Replace Power Supply PCB.
OK
Check Point 5 : Replace the Controller PCB
Replace Controller PCB and set up the original address.
OK
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