Johnson Controls Z Series Installation And Maintenance Manual page 23

Display Method of Indoor Unit
Indicator Display (during
Malfunction
blinking, ON 0.5s and OFF
Dual-8
NO.
Name
0.5s)
Code
Display
Operation
Indicator
Malfunction of
phase current
44 detection U1
circuit for
compressor
Malfunction of
voltage
45 U3
dropping for
DC bus-bar
Malfunction
of complete
46 U5
units current
detection
The four-way
47 valve is U7
abnormal
Zero-
crossing
48 U9
malfunction of
outdoor unit
Frequency
49 limiting
(power)
Compressor
50
running
The
temperature
51 for turning
on the unit is
reached
Frequency
limiting
52
(module
temperature)
15
Display Method of Outdoor
Unit
Indicator has 3 kinds of
display status and during
blinking, ON 0.5s and OFF
0.5s
Cool Heating Yellow Red
Indicator Indicator Indicator Indicator
OFF 1S
and blink
13 times
OFF 1S
and blink
once
OFF 1S
and blink
8 times
OFF 1S
and blink
11 times
A/C status
Green
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.
During cooling operation,
compressor will stop while
indoor fan will operate; during
heating,the complete unit will
stop operation.
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.
Replace outdoor control panel AP1
Installation and Maintenance