1. Problem Solving using Error Code Saijo Denki Inverter R-410A

2. Error Detection using Error Code from 7-SEG
01/11/10
Error Detection using Error Code from 7-SEG 2

3. 7-SEG display at indoor unit
Error Code Detection
Saijo Denki Inverter air conditioner can show error code in 2 ways
7-SEG display at the indoor unit. We can check Error code by pressing CLR button in the remote control 4 times continuously in 3 seconds.
Get Error Code from smart phone application “Saijo Denki Inverter – Engineer”.
7-SEG display at indoor unit
Show Error

4. LED Display at indoor unit
01/11/10
LED Display at indoor unit
LED POWER.
OFF : AC OFF
ON : AC ON
BLINK 3 times: Room temperature thermistor fail
BLINK 4 times: Indoor Inlet temperature sensor fail
LED COMP.
ON : Compressor ON
BLINK very frequently : Indoor unit can not communicate with Outdoor unit
BLINK slowly: Air Conditioner in Error. Please press CLR button at remote control 4 times in 3 seconds to check Error Code at 7-SEG of indoor unit

5. Error Code Table is at every indoor unit.
01/11/10
Error Code Table is at every indoor unit.
Status
Number of LED’s blink
Hot Cool
LED comp/ power
Water floating
ID inlet fail
ID room tmp fail
OD comp top tmp fail
OD inlet tmp fail
OD discharge tmp fail
OD coil tmp fail
OD comp over
OD ctrl fail
OD comp wire fail
Sys liq qt fail
OD cooling fail
Water floating
OD comp current fail
ID cooling fail
Restore the status by turn off air condition and press “CLR” 4 time at remote
Clear error code by press “CLR” 10 time consciously 5

6. Sensor Fail Error from Sensor Fail Status 01/11/10 6
Number of LED’s blink
Hot Cool
LED comp/ power
Water floating
ID inlet fail
ID room tmp fail
OD comp top tmp fail
Error from Sensor Fail
OD inlet tmp fail
OD discharge tmp fail
OD coil tmp fail
OD comp over
OD ctrl fail
OD comp wire fail
Sys liq qt fail
OD cooling fail
Water floating
OD comp current fail
ID cooling fail
Restore the status by turn off air condition and press “CLR” 4 time at remote 6

7. Resistance of Sensor is 5K at 25 c temperature
01/11/10
Error 3,4,5,13,14,15: Room Temperature Sensor
Ambient sensor
Discharge sensor
Sensor is broken or damage
Replace / Connect Sensor to indoor unit
Mid coil sensor
Room temp sensor
Yes No
Mid cooling coil sensor
Check Sensor Resistance
Change Room temperature sensor
Change Indoor PCB Board
Normal
Abnormal
Resistance of Sensor is 5K at 25 c temperature 7

8. Error 17: Compressor Overload
01/11/10
Error 17: Compressor Overload
Outdoor PCB detects Overcurrent to compressor
Air Flow at outdoor unit is good or not ?
Make sure that outdoor unit has good air flow; remove obstacle or clean condenser coil No
Yes
Check too much refrigerant in the system ?
Decrease refrigerant in the air conditioner
Too much
Normal 8

9. Error 17: Compressor Overload (Cont)
01/11/10
Error 17: Compressor Overload (Cont)
Outdoor PCB detects Overcurrent to compressor
Check Power Line: Supply Voltage is between 175–260 V ?
Make sure supply voltage is between 175 – 260 V No
Supply Voltage must be between V
Yes
Replace Outdoor Control Box 9

10. Replace Outdoor Control Box
01/11/10
Error 11,18,19: Error in Outdoor control box
Error in Outdoor Control Box
Check if Electrical wiring from compressor to outdoor control box is tight and U V W is in order
Make tight wiring and ensure U V W is in order No
Yes
Replace Outdoor Control Box
Problem at outdoor control box
Work Properly
Problem at compressor No 10

11. Replace Outdoor Control Box
01/11/10
Error 21: Wiring to compressor loosen
Error in Outdoor Control Box
Check if Electrical wiring from compressor to outdoor control box is tight and U V W is in order
Make tight wiring and ensure U V W is in order No
Yes
Replace Outdoor Control Box
Problem at outdoor control box
Work Properly
Problem at compressor No 11

12. Check (1) Too low refrigerant (2) Clog in refrigerant line ?
01/11/10
Error 22,31 Discharge Over Temperature t
Temperature at Discharge Pipe is more than 100 c
Check Outdoor Air Flow ?
Make sure outdoor air flow is good and condenser coil is clean
Not good
Good
Check (1) Too low refrigerant (2) Clog in refrigerant line ?
Make sure refrigerant amount is properly charge and no clog in this system
Remark: if refrigerant too low, also check leakage in the system
Yes
ไม่ 12

13. Check Resistance of Discharge Pipe Sensor, ok ?
01/11/10
Error 22,31 Discharge Over Temp. (Cont.) t
Temperature at Discharge Pipe is more than 100 c
Check Resistance of Discharge Pipe Sensor, ok ? NO
Replace Discharge Pipe sensor OK
Replace Outdoor Control Box
Normal Resistance (Ω) of sensor
Temperature Resistance
25 c K ohm
30 c K ohm
35 c K ohm 13

14. Error 23: Outdoor Mid Coil temperature too high
01/11/10
Error 23: Outdoor Mid Coil temperature too high
Temperature at Mid Coil Sensor is more than 60 c
Check Outdoor motor
Replace Outdoor Motor
Abnormal
Normal
Check Outdoor Air Flow
Improve Outdoor Air Flow; remove obstacle to air flow of outdoor unit and/or clean condenser coil
Abnormal
Normal 14

15. Check too much refrigerant ?
01/11/10
Error 23: Outdoor Mid Coil temperature too high (Cont.)
Temperature at Mid Coil Sensor is more than 60 c
Condenser block
Clean Condenser
Yes No
Check too much refrigerant ?
Make sure refrigerant amount is properly charge
Yes No 15

16. Temperature at Mid Coil Sensor is more than 60 c
01/11/10
Error 23: Outdoor Mid Coil temperature too high (Cont.)
Temperature at Mid Coil Sensor is more than 60 c
Check resistance of outdoor mid coil temperature sensor
Replace Outdoor Mid Coil Temperature Sensor
Abnormal
Normal
Replace Outdoor Control Box 16

17. Current is 130% of nominal current input
01/11/10
Error 24: Overcurrent t
Current is 130% of nominal current input
Check Outdoor Air Flow is normal
Improve Outdoor Air Flow; remove obstacle to air flow of outdoor unit and/or clean condenser coil
Abnormal
Normal
Check refrigerant amount is too much or not ?
Make sure refrigerant amount is properly charge
Yes No 17

18. Check current input of compressor is 130% of nominal current input ?
01/11/10
Error 24: Overcurrent t
Current is 130% of nominal current input
Check current input of compressor is 130% of nominal current input ?
Replace Outdoor Control Box No
Yes
Replace Compressor 18

19. Check Indoor Air Flow is blocked ?
01/11/10
Error 26,27: Indoor Coil Frost t
Indoor Inlet Temperature is equal or below 0 c
Check Indoor Fan motor ?
Replace Indoor Fan Motor
Fail
Normal
Check Indoor Air Flow is blocked ?
Make sure Indoor Air Flow is good; clean evaporator and/or clean indoor filter
Block No 19

20. Check Resistance of Indoor Inlet Sensor, ok ?
01/11/10
Error 26,27: Indoor Coil Frost t
Indoor Inlet Temperature is equal or below 0 c
Check Resistance of Indoor Inlet Sensor, ok ? NO
Replace Discharge Pipe sensor OK
Replace Outdoor Control Box
Normal Resistance (Ω) of sensor
Temperature Resistance
25 c K ohm
30 c K ohm
35 c K ohm 20