9.2
Warnings
Warning
number
Description
Suggestions for resolution
W01
DC input voltage is too low.
Check the DC input voltage on the inverter display.
There may be insufficient solar radiation.
W07
The inverter is not delivering the expected power. This can
have several causes:
The temperature is too high.
Check the ambient conditions ( (e.g. air circulation).
A power limit has been set.
Change the power limit settings.
The "Active power control via mains frequency" function is
active and has regulated the active power.
Check the mains frequency.
The "Active power control via mains voltage" function is
active and has regulated the active power.
Check the mains voltage.
The mains voltage is too low.
Check the mains voltage.
The solar voltage is too low or too high.
Check the solar voltage.
W08
The polarity of the DC string is reversed.
Connect the DC strings correctly.
The string monitoring circuit is defective.
Contact Delta Customer Service.
W11
One or more fans are blocked.
Clean or replace the fans if necessary.
One or more fans are defective.
Replace the defective fans.
One or more fans are disconnected from the power supply. Check the power supply connections of the fans.
W17
A lightning bolt has struck in the vicinity of the inverter and
the DC surge protection devices have tripped.
Check on the inverter whether the DC surge protection
devices have tripped.
If yes, replace the card with the DC surge protection
devices.
One or more DC surge protection devices are defective.
Replace the card with the DC surge protection devices.
The card containing the DC surge protection devices is not
inserted correctly, fastening screws are missing or the fas-
tening screws are not tightened correctly.
Check that the card is seated correctly.
Check that there are no missing screws.
Tighten all screws.
The signal cable is not inserted correctly.
Check that the signal cable is inserted correctly.
W18
A lightning bolt has struck in the vicinity of the inverter and
the AC surge protection devices have tripped.
Check on the inverter whether the DC surge protection
devices have tripped.
If yes, replace the card with the DC surge protection
devices.
One or more AC surge protection devices are defective.
Replace the card with the DC surge protection devices.
The card containing the DC surge protection devices is not
inserted correctly, fastening screws are missing or the fas-
tening screws are not tightened correctly.
Check that the card is seated correctly.
Check that there are no missing screws.
Tighten all screws.
The signal cable is not inserted correctly.
Check that the signal cable is inserted correctly.
9 Error events and troubleshooting
Warnings
90
Installation and operation manual M70A_260 Flex RPI703M26000 EU V1.1 EN 2022-08-02
