mundoclima MUCR-H6 Series, Service Manual

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Troubleshooting
120 Electrical Control System
2.4.1.5. Indoor fan speed has been out of control.
Power off, then restart the
unit 2 minutes later. Is it still
displaying the error code?
Power off, then restart the
unit 2 minutes later. Is it still
displaying the error code?
Shut off the power supply,
rotate the fan by hand. Does
it rotate properly?
Shut off the power supply,
rotate the fan by hand. Does
it rotate properly?
The unit operates normally.
The unit operates normally.
Find out the cause and
have it solved. For
example,
whether the fan
is blocked or the screws
which fix the fan are
tighten.
Find out the cause and
have it solved. For
example,
whether the fan
is blocked or the screws
which fix the fan are
tighten.
Check the wiring of fan
motor. Are all the
connections good?
Check the wiring of fan
motor. Are all the
connections good?
No
Yes
No
Correct the connections.
Correct the connections. No
Replace the fan motor
Replace the fan motor
Yes
Yes
Replace the main PCB
Replace the main PCB No
Check whether the main PCB
is normal through index 1?
Check whether the main PCB
is normal through index 1?
Yes
No
Index 1:
1. Indoor DC fan motor (control chip is inside fan motor)
Power on and when the unit is in standby, measure the voltage of pin1-pin3, pin4-pin3 in fan motor
connector. If the value of the voltage is not in the range showing in below table, the PCB must have
problems and need to be replaced.
DC motor voltage input and output
NO. Color Signal Voltage
1 Red Vs/Vm 200V~380V
2 --- --- ---
3 Black GND 0V
4 White Vcc 13.5-16.5V
5 Yellow Vsp 0~6.5V
6 Blue FG 13.5-16.5V