Carrier 38QUS012D8S Service Manual page 108

27 Average of indoor room temperature
28 Shutdown cause
29 T2B of #1 indoor unit
30 T2B of #2 indoor unit
Appendix
Shutdown Causes
Frequency limit caused by current
Frequency limit caused by T2 in cooling
Frequency limit caused by T2 in heating
Preset temperature reached
Frequency limit caused by T4
Defrosting
Mode switching
High discharge temperature protection
High evaporator coil temperature T2 protection
Evaporator low temperature T2 protection
Condenser high temperature T3 protection
Low indoor room temperature protection in drying mode
Low
ambient
Refrigerant leakage detection
Communication malfunction between indoor and outdoor units
Communication error between outdoor main chip and compressor driven chip IR341
AC power input voltage protection
Top temperature protection of compressor
Outdoor EE Malfunction
Fan speed malfunction
Temperature sensor open or short circuit
Overcurrent protection
IMP overcurrent protection
Compressor lack of phase
Compressor malfunction
Low pressure protection of 311
Fan current protection
Fan lack of phase
Fan zero speed protection
PFC module protection
High pressure protection of 311
Zero speed malfunction
PWM malfunction
MCE malfunction
Electrical Control System
temperature protection
If the indoor unit is not connected, the digital display shows:
"――"
If the temperature is lower than 0 ℃, the digital display shows
"0".
If the temperature is higher than 70 ℃, the digital display
shows "70".
Refer to Appendix
If the temperature is lower than -9 ℃, the digital display shows
"9".
If the temperature is higher than 70 ℃, the digital display
shows "70".
If the capacity demand is 0, the digital display shows "0".
If the indoor unit is not connected, the digital display shows:
"――"
If the temperature is lower than 0 ℃, the digital display shows
"0".
If the temperature is higher than 70 ℃, the digital display
shows "70".
If the capacity demand is 0, the digital display shows "0".
If the indoor unit is not connected, the digital display shows:
"――"
Electrical Control Function
Code
1
2
3
4
5
6
7
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
106