Microinverter Issues
Clear “DC Resistance Low - Power Off” Condition
This condition occurs only with the S-Series and M250 Microinverters and one model of the M215
Microinverter (M215-60-2LL-S22-IG). 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. 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 enphase.com/en-us/support/contact.
There are two ways to send a clear message to the microinverter. Note that the condition will not clear after
sensor reset if the cause of the failure is still present. If the condition persists, contact your installer.
Method 1: Clear this error through Enlighten
• Access the System in Enlighten.
• Click the Events tab. The next screen shows that there is a current DC Resistance Low - Power Off
condition for the system.
• Click DC Resistance Low - Power Off.
• Where “n” is the number of affected devices, click n devices (show details).
• Click the serial number of the affected microinverter.
• Click the Reset DC Resistance Low - Power Off Sensor button.
The system displays, “A DC Resistance Low- Power Off reset task was issued on 08/03/2015 01:34
PM CDT for this microinverter and is still pending.”
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