RTD-NET interfaces indicate a fault state in two ways:
- LEDs 1 and 2
- Input Registers 0021, 0022, and in case of group control: **21 and **22 (*..is the P1P2 address of a unit in the group and is only in the range: 01 < ** < 16).
LEDs 1 and 2
The LED statuses which indicate a fault situation are explained in the RTD-NET installation instructions. Note that the LED status is not enough to tell which indoor unit fault has occurred. The exact fault can only be identified through the Modbus fault code register(s) or the wired remote controller's display.
Modbus registers
If there is an active fault in the system the value of Input register 21 is changed. This register returns 0 if there is no fault and 1 if there is at least one unit in fault. More details can be found on pages 10 and 11 in RTD-NET inbstallation instructions.
Input register 0022 returns the indoor unit's fault code. This is the same error code displayed on the wired remote controller's display.
If several indoor units are grouped on one P1P2 network follow the instructions detailed in this article.
Please note that fault code registers are Modbus Input registers.
Fault Codes
For the list of Daikin fault codes, please click here.