Turbo Air TAS-18EHN Service Manual page 48

9.2.3 Fan speed has been out of control diagnosis and solution(E3/E7)
Shut off the power supply
and turn it on 5 seconds
later. Is it still displaying
the error code?
Yes
Shut off the power supply,
rotate the fan by hand.
Does it rotate properly?
Yes
Check the wires of fan
motor. Are all the
connections good?
Yes
Check whether the fan
motor is normal through
index 1?
Yes
Check whether the main PCB is
normal through index 2?
No
No
No
Replace the fan
No
motor
No
Replace the
main PCB.
No The
malfunction is
solved?
Yes
48
The unit operates normally.
Find out the cause and
have it solved. For
example, check
whether the fan is
blocked or the bearing
is broken?
Correct the connections.
If the
malfunction is
still existing,
replace the
main PCB