Display Message Causes Solution
E019
Internal error
(Leakage current
sensor self- test
fail)
Before connecting to the grid, the
inverter carries out an autotest
that tests the leakage current
sensor. The test is carried out
by “forcing” a current of known
value in the leakage current
sensor: the microprocessor
compares the read value with
the known value. The error is
generated if the comparison
between the read value and the
known value during the test is
not within the allowed tolerance.
This is an error inside the inverter that cannot be
checked externally. If the problem persists (after
switching the inverter off and then on again), contact
ABB technical support. By its nature, the alarm
appears only before connection to the grid.
E020
Internal error
(Booster relay self-
test fail)
Before connecting to the grid, the
inverter carries out some internal
tests. One of these tests regards
the correct operation of the
boost relay. The test is carried
out by “forcing” the switching
of the relay and checking
its functionality. The error is
generated if a problem is found
with the operation of the relay.
This is an error inside the inverter that cannot be
checked externally. If the problem persists (after
switching the inverter off and then on again), contact
ABB technical support. By its nature, the alarm
appears only before connection to the grid.
E021
Internal error
(Inverter relay self-
test fail)
Before connecting to the grid,
the inverter carries out a test
that regards the operation of the
inverter relay. The test is carried
out by “forcing” the switching
of the relay and checking
its functionality. The error is
generated if a problem is found
with the operation of the relay.
This is an error inside the inverter that cannot be
checked externally. If the problem persists (after
switching the inverter off and then on again), contact
ABB technical support. By its nature, the alarm
appears only before connection to the grid.
E022
Internal error
(Relay self-test
timeout)
Time taken to execute the
autotest carried out on the
relays of the DC-AC circuit part
(inverter) is too long. This may
indicate a problem associated
with the aforesaid relays.
Error inside the inverter that cannot be checked
externally. If the problem persists (after switching the
inverter off and then on again), contact ABB technical
support.
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