Service Manual
Table Of Contents
- Cover
- Table of contents
- Part 1 List of Functions
- Part 2 Specifications
- Part 3 Printed Circuit Board Connector Wiring Diagram
- Part 4 Refrigerant Circuit
- Part 5 Functions and Control
- Part 6 Test Operation and Field Settings
- Part 7 Remote Controller
- Part 8 Troubleshooting
- 1. Troubleshooting with LED
- 2. Service Diagnosis
- 3. Error Codes and Description
- 4. Troubleshooting for CTXG, CTXS, FTXS, CDXS, FDXS, FVXS Series
- 5. Troubleshooting for FFQ Series
- 6. Troubleshooting for Branch Provider (BP) Unit
- 7. Troubleshooting for Outdoor Unit
- 8. Thermistor Resistance/Temperature Characteristics
- 9. Pressure Sensor
- 10. Method of Replacing Inverter’s Power Transistors Modules
- Part 9 Appendix
SiUS181631EA Troubleshooting with LED
Troubleshooting 177
Selection of check item
Monitor mode
Confirmation of malfunction 1
Press MODE (BS1) button and enter
the monitor mode.
Press SET (BS2) button and select
a check item according to the LED
pattern of No.14~16 and No.20~22.
Refer to page 130 for check items.
Press RETURN (BS3) button once
to display the first digit of error code.
Confirmation of malfunction 2
Press SET (BS2) button once to
display the second digit of error
code.
Press RETURN (BS3) button and
return to the initial status of monitor
mode.
Confirmation of malfunction 3
Press SET (BS2) button once to
display the malfunction location.
Detail
description
on next
page.
Confirmation of malfunction 4
Press SET (BS2) button once to
display the malfunction unit and the
malfunction location.
∗ If you become unsure of how to
proceed, press MODE (BS1) button
and return to the setting mode 1.
Contents of malfunction
Error
code
High voltage of capacitor in main
inverter circuit
Imbalance of inverter power supply voltage P1
Radiation fin thermistor abnormality Faulty thermistor of inverter fin P4
Low pressure drop due to refrigerant
shortage or electronic expansion valve
abnormality
Refrigerant shortage alarm U0
Power supply insufficient or
instantaneous failure
Insufficient Inverter voltage U2
Faulty charge of capacitor in main inverter circuit
Malfunction due to SP-PAM overvoltage
Malfunction due to P-N short circuit
Check operation is not conducted. U3
Transmission error between indoor
unit and BP unit
I/O transmission error U4
I/O transmission error
Transmission error between indoor
unit and outdoor unit in the same
system
Indoor unit system abnormal in other system
or other indoor unit system abnormal in own
system
U9
Field setting switch abnormality or
Excessive number of indoor units
System transmission malfunction UA
Overconnection malfunction of indoor units
Malfunction of field setting
Refrigerant abnormal
Connection error (BP unit)
System abnormality, refrigerant
system address undefined
Wiring error (Auto-address error) UH
System is not set yet Conflict in wiring and piping UF