General Assist Technical Reference
Custom Code - Wireless Remotes
Checking and matching wireless remote controller custom codes A, B, C and D
Use when a wireless remote controller appears to operate normally but the indoor unit does not respond.
Key point: The wireless remote controller and indoor unit must be set to the same Custom Code. The available codes are A, B, C and D, with A normally being the factory/default setting.
Common service scenario: If a customer has replaced the batteries or used the ACL/reset function and the remote still does not control the unit, check the Custom Code before replacing components. On some remotes the code can be changed accidentally by holding a button for several seconds or by moving a selector switch under the slide-down cover.
1. What is a Custom Code?
A Custom Code is used to pair a wireless remote controller with the indoor unit it is intended to operate. Both devices must be set to the same code for normal communication.
| Available code | Use |
|---|---|
| A | Factory/default code on many systems. |
| B | Alternative pairing code. |
| C | Alternative pairing code. |
| D | Alternative pairing code. |
Custom Codes are particularly useful where two or more indoor units are installed in the same room. Each indoor unit can be assigned a different code so that one wireless remote does not unintentionally control every unit.
Example: Indoor Unit 1 can be set to Code A, Indoor Unit 2 to B, Indoor Unit 3 to C and Indoor Unit 4 to D. Each wireless remote must then be set to the matching code for the unit it is intended to control.
2. Quick diagnostic check
| 1 | Confirm the wireless remote has good batteries and the display is operating normally. |
| 2 | If an ACL/reset has been performed and the indoor unit still does not respond, check the remote Custom Code. |
| 3 | Confirm the Custom Code selected at the indoor unit. |
| 4 | Set the wireless remote to the same code and test operation. |
Important: A remote controller can appear to be functioning correctly while transmitting a different Custom Code. Replacing batteries or using ACL does not necessarily return the Custom Code to A.
3. J Series - indoor unit Custom Code setting
The method used to set the indoor unit Custom Code depends on the indoor unit type.
3.1 Indoor units except Compact Wall Mounted type
| SW5-1 | SW5-2 | Custom Code |
|---|---|---|
| OFF | OFF | Type A - Factory setting |
| ON | OFF | Type B |
| OFF | ON | Type C |
| ON | ON | Type D |
3.2 Compact Wall Mounted type
| SW3-1 | SW3-2 | Custom Code |
|---|---|---|
| OFF | OFF | Type A - Factory setting |
| ON | OFF | Type B |
| OFF | ON | Type C |
| ON | ON | Type D |
3.3 J Series wireless remote - changing the Custom Code
- Press and hold the MASTER CONTROL button for more than 5 seconds to enter Custom Code change mode.
- Use the temperature selection buttons to select the required code: A, B, C or D.
- Press MASTER CONTROL again to finish the code change.
Service check: After changing the remote Custom Code, point the remote directly at the indoor unit and confirm that the unit acknowledges the command. If it does not, re-check the indoor DIP switch code.
4. KMCA wireless remote example
For KMCA-type wireless remote controllers, the Custom Code can be changed from the remote controller as follows.
| 1 | Press the START/STOP button until only the clock is displayed. |
| 2 | Press and hold MODE for at least 5 seconds. The current Custom Code is displayed. The initial setting is A. |
| 3 | Use the TEMP ▲/▼ buttons to select A, B, C or D. Match this code to the indoor unit Custom Code. |
| 4 | Press MODE again to return to the clock display. The Custom Code is now changed. |
KMCA notes:
- If no button is pressed within 30 seconds after the Custom Code is displayed, the remote returns to the normal clock display. Start again from Step 1.
- The air conditioner Custom Code is set to A prior to shipment.
- If the assigned indoor-unit code is unknown, try A, B, C and D until the indoor unit responds.
5. Older AR-DL series remotes
On older AR-DL series wireless remote controllers, the Custom Code may be selected by a small slide switch underneath the remote controller's slide-down door. If the remote has been dropped or handled during a battery change, confirm this selector has not moved away from the required code.
6. Technician summary
| Symptom | Recommended check |
|---|---|
| Remote display works but indoor unit does not respond | Check remote and indoor Custom Codes match. |
| Problem began after battery replacement or ACL/reset | Check Custom Code before replacing the remote. |
| One remote operates multiple units in the same room | Assign different Custom Codes to each indoor unit and corresponding remote. |
| Code is unknown | Test A, B, C and D until the intended indoor unit responds, then confirm the indoor-unit setting. |
Always confirm the specific indoor unit and remote controller service/installation documentation where the Custom Code setting method differs from the examples above.