Johnson Controls Z Series Installation And Maintenance Manual page 19

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
Gathering
11 Fo
refrigerant
Indoor
ambient
temperature
12 F1
sensor is
open/short
circuited
Indoor
evaporator
temperature
13 F2
sensor is
open/short
circuited
Outdoor
ambient
temperature
14 F3
sensor is
open/short
circuited
Outdoor
condenser
temperature
15 F4
sensor is
open/short
circuited
Outdoor
discharge
temperature
16 F5
sensor is
open/short
circuited
Limit/
decrease
17 frequency F6
due to
overload
Decrease
frequency
18 F8
due to
overcurrent
11
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
17 times
OFF 1S
and
blink
6 times
OFF 1S
and
blink
5 times
OFF 1S
and
blink
7 times
OFF 1S
and
blink
3 times
OFF 1S
and
blink
once
A/C status
Green
Indicator
When the outdoor unit receive
signal of Gathering refrigerant,
the system will be forced to
run under cooling mode for
gathering refrigerant
During cooling and drying
operation, indoor unit operates
while other loads will stop;
during heating operation,
the complete unit will stop
operation.
AC stops operation once
reaches the setting
temperature. Cooling, drying:
internal fan motor stops
operation while other loads
stop operation; heating: AC
stop operation
During cooling and drying
operating, compressor stops
while indoor fan operates;
During heating operation,
the complete unit will stop
operation
During cooling and drying
operation, compressor stops
while indoor fan will operate;
During heating operation,
the complete unit will stop
operation.
During cooling and drying
operation, compressor will sop
after operating for about 3
mins, while indoor fan will
operate; During heating
operation, the complete unit
will stop after operating for
about 3 mins.
All loads operate normally,
while operation frequency
for compressor is
decreased
All loads operate normally,
while operation frequency
for compressor is
decreased
Possible Causes
Nominal cooling mode
1. Loosening or bad contact of
indoor ambient temp. sensor and
mainboard terminal.
2. Components in mainboard fell
down leads short circuit.
3. Indoor ambient temp. sensor
damaged.(check with sensor
resistance value chart)
4. Mainboard damaged.
1. Loose or bad contact of
Indoor evaporator temp.
sensor and mainboard
terminal.
2. Components on the mainboard
fall down leads short
circuit.
3. Indoor evaporator temp. sensor
damaged.(check temp.
sensor value chart for testing)
4. Mainboard damaged.
Outdoor temperature sensor
hasn't been connected well or
is damaged. Please check it by
referring to the resistance table for
temperature sensor)
Outdoor temperature sensor
hasnt been connected well or
is damaged. Please check it by
referring to the resistance table for
temperature sensor)
1.Outdoor temperature sensor
hasnt been connected well or is
damaged. Please check it by
referring to the resistance table for
temperature sensor)
2.The head of temperature sensor
hasn't been inserted into the
copper tube
Refer to the malfunction analysis
(overload, high temperature
resistant)
The input supply voltage is too low;
System pressure is too high and
overload
Installation and Maintenance