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Trouble diagnosis
8.6
Error codes on A4 PCB (ACC-SP1A)
Green LED display
Off
Blinking at 3 s intervals
On/off out at 1 s intervals
On/off out at 100 ms intervals
On
1 Each time when setting data is transmitted to an indoor unit the LED will be turned off for 200 ms.
8.7
Thermistor curves
Suction Air (TA) temperature sensor and Discharge Air (BL) temperature sensor
Refrigerant Coil (E1, E2, E3) temperature sensor
8
86
Meaning
Power Off
12VDC
(T10 terminal)
power supply error
Indoor unit alarm
Initializing communications, com-
munications error
Normal operation
1
10
9
8
7
6
5
4
3
2
1
10
15
20
25
Temperature (°C)
40
35
30
25
20
15
10
5
0
-20
-15
-10
-5
0
Temperature (°C)
Action to take
Check the remote control line connection (A4 PCB CN1 terminals
12 & 13 to A1 PCB CN041 blue)
Check the power supply line connection (A4 PCB CN1 terminals
14 & 15 to A1 PCB T10 CN061 yellow contacts 2 & 5) Attention
polarity!
Check and clear the indoor unit alarm
Check the remote control line connection (A4 PCB CN1 terminals
12 & 13 to A1 PCB CN041 blue)
–
30
35
40
45
50
55
5
0 1
5 1
0 2
8
7
6
5
4
3
2
1
0
20
30
40
Temperature (°C)
AHU Kit – Installation Instructions – 07/2023
50
60
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