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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

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 762 260 or fill in an online solar inverter enquiry form and one of our friendly team will contact you.

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