enphase M250 Troubleshooting Guide

Troubleshooting an Enphase System
 2014 Enphase Energy Inc. August 2014
43
Microinverter Failed to Report
A microinverter that reports a Microinverter Failed to Report condition is unable to communicate with
the Envoy over the AC power lines. Occasional instances of this error may be ignored as microinverter
communications will likely recover on the next reporting cycle.
 Verify that the site has service from the electrical utility and that no solar circuit-breaker has
tripped.
 If communications do not recover right away (the Envoy polls the microinverters every five
minutes), make sure that the Envoy is plugged in very near to the circuit breaker panel. Also, if
other devices are sharing the electrical outlet with the Envoy, remove those devices to improve
communication signal strength.
 If the Envoy was recently relocated, or if new devices or appliances were added to the circuit, the
new location may not be suitable for power line communications. You may need to relocate the
Envoy to improve signal strength and reduce interfering noise on the power lines.
 If several microinverters are reporting this condition, you may need to relocate the Envoy to
another electrical outlet to improve communication signal strength.
For further troubleshooting steps, see “Microinverters are not detected, or, power line communication
level is low or poor” on page 22.
Over Temperature
See “Critical Temperature” on page 37.
Zigbee Device Failed to Report
If the Envoy is connected to an Environ thermostat, this condition may occur if there is an interruption in
communication between the Environ thermostat and the Envoy.
Make sure the Envoy ZigBee USB stick is plugged into the Envoy. Occasional instances of this error may
be ignored, as a temporary interference to the radio signal may cause this condition and will recover on
its own. If this condition persists, it may be necessary to add a ZigBee repeater to boost signal strength
between ZigBee devices.
See the Environ Smart Thermostat Installation and Operation Manual at
http://www.enphase.com/support
for more information.
Zigbee USB Stick Removed
The Envoy Communication Gateway no longer detects the presence of the ZigBee USB stick. Make sure
that the ZigBee USB stick is fully seated in the Envoy USB port.

enphase M250 Specifications

General

Model	M250
Manufacturer	Enphase Energy
Efficiency	96.5%
Output Voltage	240 V
Operating Temperature Range	-40°C to +65°C
Maximum Output Current	1.04 A
CEC Efficiency	96.0%
Start-up Voltage	22 V
Output Frequency	60 Hz
Enclosure Rating	IP67
Weight	1.6 kg