Envoy Installation and Operation
2014 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 - Power Off Condition
This condition occurs only with the M250 Microinverter and some models of the M215 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 - Power Off” 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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