Delta inverters

If your inverter is less than 5 years old, there’s a good chance you still have warranty (assuming the manufacturer is still in business).
Not sure if the inverter is faulty, or if it is actually reporting a fault elsewhere in your solar system?

See below for the error codes recognized with your Delta inverter/solar system.

If you are still unsure call us to see if we can help you over the phone, or book in a Solar Health check.
You could save big $$$’s with one of our Solar accredited teams expert appraisal. 
If you believe that your Inverter may be subject to an Insurance claim please contact us on 07 3274 4365 and advise us of the details

COMMON DELTA ERRORS

LED STATUS

 DISPLAY MESSAGE

CAUSE

ACTION TO TAKE

green:
red:
yellow:

 

Display communication faulty.

If the fault persists after the device has been reset, please inform your service technician.

green:
red:
yellow:

AC frequency failure

Grid frequency overshooting or undershooting specified limit range.

 Check the grid frequency via the display in the N (NOW) menu.

green:
red:
yellow:

AC voltage
failure

Grid voltage overshooting or undershooting specified limit range.

Check the grid voltage via the display in the N menu.
If no voltage present, check grid automatic circuit breaker.

green:
red:
yellow:

AC relay
failure

One of the anti-islanding protection output relays is faulty / defective.

The solar inverter is defective.
Return the device.

green:
red:
yellow:

Calibration
ongoing

Check internal settings.

Normal function before input mode.

green:
red:
yellow:

DC injection
failure

DC component of input side alternating current is too high.

If the fault persists after the device has been reset, please inform your service technician.

green:
red:
yellow:

Error # 301

Internal communication
error or hardware fault.

If the fault persists after the device has  been reset, please inform your service technician.

green:
red:
yellow:

Error # 302

The device trips and
reverts to grid input mode
once the temperature has
dropped.

Check the installation site (no direct
sunlight, air circulation).

green:
red:
yellow:

Error # 506
Error # 508

Isolation resistance fault
on the DC side during
start-up phase (# 508) or
running phase (# 506).

Check the isolation resistance on the DC side of the PV modules.

green:
red:
yellow:

Isolation start up warning
Isolation running warning

Isolation resistance fault
on the DC side during
start-up phase or running
phase.

You must check the isolation resistance on the DC side of the PV modules.
Solar inverter is still feeding!

green:
red:
yellow:

PV+ grounding fault
PV- grounding fault

Connection PV+ (PV-)
to GND is interrupted or
wrong pole is connected
to GND.

Check that the GND connection has been
made correctly and/or check the fuse in
the grounding path. Change the fuse if
necessary. The solar inverter remains in
feed-in operation.

green:
red:
yellow:

Revision error

Versions of hard and software are not compatible.

If the fault persists after the device has been reset, please inform your service technician.

green:
red:
yellow:

Self-test ongoing

Initialization of solar inverter on start-up.

The first time the solar inverter is started up: Normal function with a PV cell voltage
of between 100 V and 150 V.

green:
red:
yellow:

PV power too low

Insufficient input power.

Insufficient insolation (dawn/twilight).
Check the PV cell voltage via the display in the N menu.

green:
red:
yellow:

PV voltage too low

PV generator voltage between 100 V and 150 V.

Insufficient insolation.
Check the PV cell voltage via the display in the N menu.

green:
red:
yellow:

Synchronize to AC

Checks grid voltage and
grid frequency for grid
input mode.

Normal function before input mode.

green:
red:
yellow:

Varistor warning

Internal varistor at the DC
input is defective.

Although you can, in theory, carry on using the solar inverter, the varistors should be replaced at the earliest
opportunity. This will involve returning the device.
If you are still unsure call us to see if we can help you over the phone, or book in a  Solar Health check .
You could save big $$$’s with one of our Solar accredited teams expert appraisal. 

If you believe that your Inverter may be subject to an Insurance claim please contact us on 07 3274 4365 and advise us of the details.