The power module receives 24 VAC and has two indicator lights. These lights tell a story of communication and power from the power module to the facepack, station modules, and communication modules.
L1 is the communication indicator Light
| Indicator Light 1 Activity | Meaning | Solution |
| Off | Normal operation | Normal operation |
| On solid | The power module cannot contact the facepack. | Reseat the facepack connector to ensure it is securely connected. If that does not resolve the issue replace the power module with a known good power module from another controller. If the problem persists, replace the facepack with a known good facepack from another controller. |
| 1 blink | After identifying itself to the facepack the power module did not receive a reply. | Reseat the facepack connector to ensure it is securely connected. If that does not resolve the issue replace the power module with a known good power module from another controller. If the problem persists, replace the facepack with a known good facepack from another controller. |
| 2 blinks | The power module has lost contact with the facepack. If this occurs and a transformer overload is detected the power module will begin to turn off any running stations. | Reseat the facepack connector to ensure it is securely connected. If that does not resolve the issue replace the power module with a known good power module from another controller. If the problem persists, replace the facepack with a known good facepack from another controller. |
L2 is the power indicator Light
| Indicator Light 2 Activity | Meaning | Solution |
| Off | Normal operation. | Normal operation. |
| On solid | 24 VAC frequency is out of range. | Replace the power module. |
| 1 blink | 24 VAC voltage is low. | Replace the power module. |
| 2 blinks | 24 VAC overload detected. If 24VAC overload happens while a station is on the controller will wait 15 seconds and then turn the station off. When the station turns off the indicator will turn off because the overload should be gone. If the overload happens when no station is running the indicator will continue to flash because the controller will not turn any stations off. | The sprinkler or valve solenoid is bad and must be replaced. |
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