Nobu NBL4-09IDU32 Service Manual page 44

Service Manual
Display Method of Indoor Unit
Malfunction
Dual-8
No.
Name
Code
Display
Malfunction of
phase current
43 detection U1
circuit for
compressor
Malfunction of
voltage
44 U3
dropping for
DC bus-bar
Malfunction
of complete
45 U5
units current
detection
The four-way
46 valve is U7
abnormal
Frequency
47 limiting
(power)
Compressor
48 is open-
circuited
The
temperature
49 for turning
on the unit is
reached
Frequency
limiting
50
(module
temperature)
Malfunction
of detecting
51 JF
plate(WIFI)
40
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
and blink
Display Method of Outdoor
Unit
Yellow Red Green
Indicator Indicator
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
During heating operation, the
complete unit will stop
During cooling and drying
operation, compressor will stop
while indoor fan will operate;
During heating operation, the
complete unit will stop
During cooling and drying
operation, the compressor will
stop while indoor fan will
operate;
During heating operating,
the complete unit will stop
operation.
If this malfunction occurs
during heating operation,
the complete unit will stop
operation.
OFF 3S
and blink
13 times
OFF 3S
once
OFF 3S
and blink
8 times
OFF 3S
and blink
11 times
A/C status Possible Causes
Replace outdoor control panel AP1
Supply voltage is unstable
Theres circuit malfunction on
outdoor units control panel AP1,
please replace the outdoor units
control panel AP1.
1.Supply voltage is lower than
AC175V;
2.Wiring terminal 4V is loosened or
broken;
3.4V is damaged, please replace
4V.
Installation and Maintenance
Service Manual
79