Nobu NBL4-09IDU32 Service Manual page 42

Service Manual
Display Method of Indoor Unit
Malfunction
Dual-8
No.
Name
Code
Display
Compressor
intermediate
26 P3
frequence in
test state
Overcurrent
protection of
27 phase P5
current for
compressor
Charging
malfunction
28 PU
of capacitor
Malfunction
of module
29 P7
temperature
sensor circuit
Module high
30 temperature P8
protection
Overload
31 protection for H3
compressor
IPM
32 H5
protection
Malfunction
of zero-cross
33 U8
detection
circuit
38
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
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
operation.
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 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
OFF 3S
while indoor fan will operate;
During heating operation, the
8 times
complete unit will stop
operation.
During cooling and drying
operation, compressor will stop
OFF 3S
while indoor fan will operate;
During heating operation, the
4 times
complete unit will stop
operation.
The complete unit stops
A/C status Possible Causes
Showing during middle cooling or
middle heating test
Refer to the malfunction
analysis (IPM protection, loss
of synchronism protection and
overcurrent protection of phase
current for compressor.
Refer to the part three—charging
malfunction analysis of capacitor
Replace outdoor control panel AP1
After the complete unit is de-
energized for 20mins, check
whether the thermal grease on IPM
Module of outdoor control panel
AP1 is sufficient and whether the
radiator is inserted tightly. If its no
use, please replace control panel
AP1.
1. Wiring terminal oVC-CoMP
is loosened. In normal state, the
resistance for this terminal should
be less than 1ohm.
2.Refer to the malfunction analysis (
discharge protection, overload)
Refer to the malfunction
analysis (IPM protection, loss
of synchronism protection and
overcurrent protection of phase
current for compressor.
1.Power supply is abnormal;
2.Detection circuit of indoor control
mainboard is abnormal.
Installation and Maintenance
Service Manual
77