Carrier 40VM Series - Page 70

70
E6: CHECK DC FAN ERROR 3
1. Error display:
IDU display: E6
2. Applicable models:
40VMH, 40VMA (high static pressure and outside air unit)
3. Error definition:
DC fan error in IDU -- No fan is detected on the main board, and specific speed difference exists between actual speed and
target speed.
4. Possible causes:
• The line from the main board to the fan motor is loose, disconnected, or improperly connected
• Damaged fan motor
• Damaged main board of indoor unit
Power off
Power on
Replace the main board
the system operates
normally?
Error
resolved
of IDU, and check whether
Is the blower wheel stuck?
Make sure the IDU power supply is correct
Check whether the wire from the fan motor to the
indoor unit is loose
Check whether the communication wire is
disconnected or loosened from main control board to
the unit.
Check whether the
DC310V power between the red
and black lines on the CN24 terminal of main
board of IDU is correct. Check whether the DC15V power
between the black and white lines on the CN24 terminal of main
board of IDU is correct.
Connect the special motor to CN24 terminal
of main board. Power on and operate at low speed.
Error
Resolved
Remove obstacles
Reconnect to the previous motor
and power on with E6 error remaining. Check
whether the red indicator LED1
lights up
Connect the wire
Connect the wire
Power it on and restart IDU, is E6 error
eliminated?
Replace the main
board of IDU
Replace the main
board of IDU
Apply proper
Replace the main
board of IDU
Replace the motor
YES
NO
YES
YES
NO
NO
NO
NO
NO
YES
NO
NO
YES
NO
NO
YES
YES
NO
Without a special motor
power supply
Does the system operate normally?