8 — DIAGNOSTIC AND TROUBLESHOOTING
pg. 75
Return to TOC Curtis Model 1226 – September 2019
LED DIAGNOSTICS
e 1226 controller has red and yellow status LEDs. Table 32 describes how the LEDs indicate the
controller’s status.
Table 32 LED Statuses
Status Red Light Yellow Light
OK Off
The ash cycle is 1.5s. The LED blinks for
500ms, followed by a 1s delay.
Downloading Firmware On On
Nonoperational On Off
Fault Flashes the rst digit of the fault code. Flashes the second digit of the fault code.
For details, see the following section.
Invalid Software Fast Flash Off
Fault Codes
Fault codes consist of two digits, with the digits delimited by a comma. For example, the Parameter
Change fault’s code is 5,2.
e red status LED shows the fault code’s rst digit and the yellow LED shows the second digit. e
fault LEDs’ ash cycle operates as follows:
• e red LED is on for 250ms, followed by a 250ms delay.
• e yellow LED is on for 250ms, followed by a 250ms delay.
• A 2s delay occurs, then the cycle is repeated until the fault is cleared.
If there are multiple active faults, the controller ashes each fault code using the sequence described
above. Aer fault codes for all active faults have been ashed, an additional 2s follows the last fault
code.
Figure 14 shows how the status LEDs ash when both the 3,4 and 5,2 faults are active. Each block
in the diagram represents 500ms.
Repeats
Note: Fault codes are described in Table 33.
Figure 14
Fault Code LEDs
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