DELUXE
Inverter
Service
M
anual
（
4
）
E4 -Internal fan
motor
error of wall mounted air conditioner
（
PG motor
）
Explanation of
error
Cause:
PG motor is equipped with speed feedback signal line. When the
feedback signal of speed is not received by the main internal control panel, it
has no way to recognize the rotating speed of motor, which will be indicated as
“Internal fan error”. Main causes for the disappearance of speed feedback
signal are as follows:
1.
The fan is stuck
.
2. The speed feedback component in the fan is broken
3. Error
from the
receiving circuit for the speed feedback signal from the main
internal control panel.
Inspection path
：
Is PG motor stucked→Speed feedback line→Speed feedback
terminal connector→main internal control panel.
Tools required
for inspection
Multimeter, A PG motor in normal working condition
Frequent
problematic part
Mechanical jam problem of internal fan, PG motor, main internal control panel
Inspection
procedure and
key points
1. Check whether the fan can work for a period of time before the error occurs.
If yes, the reason of mechanical jam can be
discarded
.
2. Disconnect the power supply and move the
internal
fan blade by
hand to see
if there’s any
resistance. Some occasional internal fan error may
relate
to
problems with the
bearing
s
.
3. Reconnect the drive wire and speed wire
to
discard
any fan
error due to
a loose
connector.
4. Check whether the plug-in terminal of
the
speed
wire
on the control panel is
loose and pull the terminal slightly for inspection if necessary.
5.
Temporarily unplug the presumed faulty motor and connect another PG
Special attention
The main internal control panel will not indicate “internal fan error” when
the internal fan is still rotating; sometimes such error will not be reported when
obvious fan problems exist (such as the low-speed rotation due to damaged fan
capacitors, or non-uniform rotating speed due to abnormal speed feedback.
Therefore,
m
aintenance
personnel
is required for the troubleshooting of
the
fan
motor
error.
Make a flexible judgment of the situation in combination
with the actual conditions and follow common sense operational procedures
comparing them to normal operating standards.
27
motor (do NOT remove the presumed faulty motor for the time being). Turn
back on the A/C. If the main control panel still indicates “internal fan error”,
then replace the main internal control panel, connect the original fan motor. If
the error disappears, replace the presumed faulty motor with the new PG
motor.
