Bosch Inverter Error Codes
In 2016, Bosch pulled out of the Australian solar power inverter market due to not being able to meet the specifications and requirements of Australian conditions.
Here is a current list of common Bosch solar inverter Error Codes with potential solutions
If you find any of the below errors please call us on 1300 054 488, we can be there today to under take a $99 Solar System Performance & Safety Check!
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| Fault | LED status | Possible cause | Possible Solutions |
| TEMP LIMITS | Top LED red | Ambient temperature is outside the temperature limits | Check the installation
conditions (Requirements for the installation location, p. 42) |
| DC VOLTAGE | Left LED red | Solar power system
field designed or connected incorrectly |
Check the voltage of
the solar power system field |
| AC CONNECTION | Right LED red | Faulty grid connection | Check installation and
connector pin assignment (Connecting the network cable (AC cable), p. 65) |
| AC CONNECTION PE | Right LED red | Faulty grid connection | Check installation and
connector pin assignment |
| GRID FREQUENCY | Right LED red | Grid frequency is
outside tolerance |
Check grid frequency,
if necessary contact the grid operator |
| AC VOLTAGE | Right LED red | AC surge voltage | Check voltage, if
necessary contact the grid operator |
| FIRMWARE | Top LED red | Incorrect firmware due to wrong firmware updates | Perform firmware
update again. During the firmware update, do not disconnect the string inverter from the grid or the Internet/ computer. |
| INT ELECTRONICS | All LEDs permanently red | Faulty electronics | Contact Bosch Power
Tec Service (see contact details on the back of the manual) |
| COM FAULT | Bottom LED red | Communication fault | Check connected
accessories and internet connection |
| SERVICE SWITCH | All LEDs are flashing red | Internal defect | –Do not touch the
device –Switch off the AC fuse –If DC circuit breaker is available within the installation, set the DC circuit breaker to 0 (=off). –Contact Bosch Power Tec Service (see contact details on the back of the manual) |
| DC ISOLATION | All LEDs are flashing
red |
–Short circuit
–Earth fault |
–Do not touch the
device –Switch off the AC fuse –If DC circuit breaker is available within the installation, set the DC circuit breaker to 0 (=off). –Contact Bosch Power Tec Service (see contact details on the back of the manual) |
Fallon Solutions team can take care of all your solar inverter issues, upgrades and can also offer a 26 point safety check of your existing system. Simply call us on 1300 054 488 or fill in an online solar inverter enquiry form and one of our friendly team will contact you.
