Observe the Status LEDs on the front of the expansion module. Table 1 provides LED status indicator information for troubleshooting the expansion module.
General troubleshooting provides some additional troubleshooting information for possible problems.
Note: If you experience short circuits in the 24 VAC power supply causing protective devices such as breakers or fuses to trip, make sure that the power connections on theCH-PCV1930 are not reversed. The most common cause of this problem is when the 24 VAC power supply on the CH-PCV1930 is reversed but not reversed on a connected secondary device. Improper wiring of this power terminal may cause a short circuit across the 24 VAC power supply.