14
Model: TX-203,TX-204,TX-228; Article No. 5021,5023,5040; 10/2022
LED status
The LED of each micro inverter provides information about the current status. All micro
inverters draw their supply voltage from the DC connector/solar panels.
Status during power up
The green LED will flash fast a few times. Then switch-on process usually takes up to
2 minutes. Following LED status can occur:
Flashing fast red (1s):
No AC connection
→
no grid feed
Flashing slow green (3s):
AC connection &
DC connection voltage lower 22V
→
no grid feed
Flashing fast green (1s):
AC connection &
DC connection voltage over 22V
→
grid feed
No LED Flashing/LED off:
No DC connection/solar panels
connected
→
no grid feed
Status after the switch-on process
A fast green flashing LED indicates normal status and an active feed into the grid. If
the LED remains flashing red after 3minutes, this indicates an error with solar panel
voltage that is too low (below 22V) or a missing AC voltage.
The micro inverter can only start feeding (again) after the cause of the error has been
eliminated. The reason for this error could be a faulty solar panel connection / AC
connection or the connected grid exceeds / falls below the voltage / frequency range
of the micro inverter. If the LED shows no function or remains OFF, the most common
cause is that there is no connection to the solar panel or the solar panel voltage is far
below the start voltage.
Troubleshooting
Maintenance work and troubleshooting on the micro inverter may only be carried out
by qualified personnel. Modifications to the micro inverter are generally prohibited.
The micro inverter is potted, the electronics cannot be repaired. The TX-203/TX-204
micro inverter draws its supply voltage from the DC side. To restart the micro inverter,
the solar panels must be disconnected from the micro inverter. The start-up process
usually takes place within 2 minutes. For troubleshooting purposes, perform the
following steps in the order listed:
1. Check that all AC fuses are turned ON.
2. Check all connection cables for external damage.
3. Check all AC side connections for damage or connection errors.
4. Measure at the connection points. The applied mains voltage must not exceed or
fall below the AC voltage range of 180-275V.
5. Restart the micro inverter by disconnecting and reconnecting the DC power / solar
panels. A normal start-up process should be indicated by a green LED (see LED
status).
CAUTION!
Never disconnect the DC cables while the micro inverter is generating power.
