Midea MDV-D22Q1/N1-D Technical Manual page 39

3.5.5. Procedure
The fan is stuck or blocked
Control and/or power wires between
main PCB and fan motor are loose
IDU power supply is abnormal
The fan control and/or fan power
supply voltages are abnormal
Replacing the fan motor resolves the
Replace indoor main PCB
Notes:
1. The fan connection on each type of indoor unit main PCB is labeled in Figures 1.1 to 1.19 in
2. Measure the voltage between the red and black wires and between the white and black wires at the fan connection on the indoor unit main PCB. The
normal voltage between the red and black wires is 310V (DC); the normal voltage between the white and black wires is 15V (DC). The fan connection on
each type of indoor unit main PCB is labeled in Figures 1.1 to 1.19 in
3. Remove the fan motor and install a new one. Power-on the unit, set it to run with fan speed set to low, and see if the unit runs normally or not.
E6
No
1
No
No
2
No
3
error
No
Figure 5.1: Fan connection wiring on indoor unit main
PCBs
Yes
Remove obstacles
Ensure the wires are connected
Yes
Yes
Provide normal power supply
Yes
Replace indoor main PCB
1, "Main PCB
1, "Main PCB Ports". Refer also to Figure 5.1.
properly
Ports".