Nobu NBL4-09IDU32 Service Manual page 43

Service Manual
Display Method of Indoor Unit
Malfunction
Dual-8
No.
Name
Code
Display
Internal motor
34 (fan motor) do H6
not operate
Desynchro-
35 nizing of H7
compressor
PFC
36 HC
protection
Outdoor DC
37 fan motor L3
malfunction
power
38 L9
protection
Indoor unit
and outdoor
39 LP
unit doesnt
match
Failure start-
40 LC
up
Normal
41 communica-
tion
42 Defrosting
Installation and Maintenance
78
Indicator has 3 kinds of
Indicator Display (during
display status and during
blinking, ON 0.5s and OFF
blinking, ON 0.5s and OFF
0.5s)
0.5s
operation Cool Heating
Indicator Indicator Indicator Indicator
OFF 3S
and blink
14 times
OFF 3S
and blink
OFF 3S
and blink
16 times
OFF 3S
and blink
once
OFF 3S
(during
and blink
blinking,
oN 10s
and OFF
0.5s)
Display Method of Outdoor
Unit
Yellow Red Green
Indicator Indicator
Internal fan motor, external fan
motor, compressor and electric
heater stop operation,guide
louver stops at present
location.
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
During heating operation, the
complete unit will stop
operation.
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
During heating operation, the
complete unit will stop
operation.
OFF 3S
Outdoor DC fan motor
and
malfunction lead to compressor
blink
stop operation,
14 times
compressor stop operation and
Outdoor fan motor will stop
30s latter , 3 minutes latter
9 times fan motor and compressor will
restart
compressor and Outdoor fan
motor cant work
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
During heating operation, the
complete unit will stop
operation.
contino-
usly
Defrosting will occur in heating
mode. Compressor will operate
while indoor fan will stop
twice
operation.
A/C status Possible Causes
1. Bad contact of DC motor
feedback terminal.
2. Bad contact of DC motor
control end.
3. Fan motor is stalling.
4. Motor malfunction.
5. Malfunction of mainboard rev
detecting circuit.
Refer to the malfunction
analysis (IPM protection, loss
of synchronism protection and
overcurrent protection of phase
current for compressor.
Refer to the malfunction analysis
DC fan motor malfunction or
system blocked or the connector
loosed
To protect the electronical
components when detect high
power
Indoor unit and outdoor unit doesnt
match
Refer to the malfunction analysis
Its the normal state
Installation and Maintenance
Service Manual
39