Carrier 42QHC009D8S Series Service Manual

45
18.3.3.4 Outdoor unit fan speed has been out of control (E8)
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 PCBNo
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. Outdoor 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
140V~380V
2
---
---
---
3
Black
GND
0V
4
White
Vcc
13.5-16.5V
5
Yellow
Vsp
0~6.5V
6
Blue
FG
15V

Carrier 42QHC009D8S Series Specifications

General

Brand	Carrier
Model	42QHC009D8S Series
Category	Air Conditioner
Language	English