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11. Service and Maintenance
Error
codes
Appearance, Portion, Parts
seemed wrong
Method of check
Troubleshooting
Figure/
Table
Error
reset
C3
Lower Fan
motor error
(1639U)
Fan motor error
(0639U, 1039U)
Fuse CF6
(1639U : 250V T3.15A)
Check the electric continuity
of Fuse CF6 by tester
If CF6 is blown, it should be replaced
Fig. 2
Manual
Fuse CF7
(1039U : 250V T3.15A)
Check the electric continuity
of Fuse CF7 by tester
If CF7 is blown, it should be replaced
Fan motor
Check the voltage of Fan
motor by tester
If the voltage is normal, Fan motor
should be replaced
If the voltage is normal, PCB (Main)
should be replaced
PCB (Main)
C4
Rise of
temperature
of PCB (Main)
(above 110°C)
Mis-installation
Check the place of installation
(blockage of air inlet & outlet)
Ensure the installation position to
avoid blockage of air inlet & outlet
Sensor, Temp.
PCB (Main)
PCB (Main) should be replaced
C5
PCB (Main)
sensor error
Sensor, Temp.
PCB (Main)
PCB (Main) should be replaced
Auto
C6
PCB (Main)
error
PCB (Main)
PCB (Main) should be replaced
Power
OFF
C7
PCB
(Controller)
serial error
Mis wiring
or rare contact
[PCB (Main)
- PCB (Controller)
connecting cable ]
Check the wiring connection
and rare contact
After correcting mis wiring, restart
operation
Auto
PCB (Controller)
Other than described above
PCB (Controller) should be
replaced
PCB (Main)
Other than described above
PCB (Main) should be replaced
EARTH WIRE
Check if earth wire is properly installed
C8
PCB (Main)
error
PCB (Main)
Turn off the power supply,
wait for about 3 minutes, then
power up again
If the same error code appears,
PCB (Main) should be replaced
Power
OFF
Check loose cable connections
and contacts of reactor
E4
Outgoing water
temp. sensor
error
Sensor, Temp.
Outgoing water
Check the resistance by tester If the sensor is faulty, it should be
replaced
Table 4
Auto
E5
Return water
temp. sensor
error
Sensor, Temp.
Return water
Check the resistance by tester If the sensor is faulty, it should be
replaced
Table 4
FU
High pressure
switch is
operating
(1639U)
Outside air
recirculation
Check the place of installation
(blockage of air inlet & outlet)
Make sure the position doesn't block
the air inlet and outlet
Manual
Clogged water circuit
Check temperature difference
of Outgoing/Return water
(see Monitor display function)
Large difference means flow
rate is too low
Remove the blockage, then restart
operation
P1
Pump error
Pump (*2)
Check the voltage of Pump
If the voltage is normal, Pump should
be replaced
If the voltage is abnormal, PCB (Main)
should be replaced
Fig. 4
PCB (Main)
Clogged the water
Pump and/or water
circuit
Check the pump and water
circuit
Remove the blockage, then restart
operation
P3
High pressure
switch error
(1639U)
High pressure switch
Check loose cable connections
and contacts
If the same error code appears, high
pressure switch should be replaced
Power
OFF
Summary of Contents for AEYC-0639U-CH
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