Heat Controller B-DVH09SD-0 Service Manual page 36

DVC/DVH Inverter Mini-Split
10.3.4 Fan Speed is Out of Control Diagnosis and Solution (E3)
Error Code
Malfunction decision
conditions
Possible Causes
Trouble shooting:
Shut off the power supply
and turn it on 5 seconds
later. Is it still displaying
Shut off the power supply,
rotate the fan by hand.
Does it rotate properly?
Check the wires of fan
connections good?
Check whether the fan
motor is normal through
Check whether the main PCB is
normal through index 2?
Note: See next page for information pertaining to Index 1 and 2.
E3
When indoor fan speed runs at 300RPM or lower for certain
period of time, the unit will stop and the LED will display the
failure.
●
●
●
●
the error code?
Yes
Yes
motor. Are all the
Yes
index 1?
Yes
Wiring error
Faulty Fan Assembly
Faulty Fan Motor
Faulty PCB
No The unit operates normally.
No
No
Replace the fan
No
motor
No
Replace the
main PCB.
No The
malfunction is
solved?
Yes
36
34
Find out the cause and
Find out the cause and
have it solved. For
try to fix it. For example,
example, check
check whether the fan
whether the fan is
is blocked or the
blocked or the bearing
bearing is broken?
is broken?
Correct the connections.
If the
If the malfunc-
malfunction is
tion is still
still existing,
exists, replace
replace the
the main PCB
main PCB
Heat Controller