Envoy Installation and Operation
ļ 2013 Enphase Energy Inc. 141-00011 Rev 05
3. In the clear-gfi box, select set.
4. Click Send Command to complete this task.
Clear DC Resistance-Low Condition
This condition occurs only with the M250 microinverter. A solid red status LED on the microinverter
indicates this condition. The LED will remain red and the fault will continue to be reported by the Envoy
until the error has been cleared.
An insulation resistance (IR) sensor in the microinverter measures the resistance between the positive
and negative PV inputs to ground. If either resistance drops below a threshold, the microinverter stops
power production and raises this condition. This may indicate defective module insulation, defective
wiring or connectors, moisture ingress, etc. Although the cause may be temporary, this microinverter
condition persists until the sensor is manually reset.
If a microinverter registers a DC Resistance Low condition, you can attempt to clear this condition through
the Envoy Interface. An Envoy is required to send the clear-dc-resistance-low message to clear the
condition. If the condition does not clear after you perform the following procedure, contact Enphase
Energy customer support at support@enphaseenergy.com.
To send the clear-dc-resistance-low message to a microinverter:
1. From the Administration menu, choose Device Conditions and Controls.
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