D2CND024A1AA + D2CND024A4AA + D2TND012A4AA +
D2TND018A4AA + D2TND024A4AA
Wall-mounted condensing boiler
ESIE17-09 / 2017.11
Servicing manual
43
10 Troubleshooting
ERROR
CODE
REASON ELIMINATION
J6-20
Return
sensor over-
heating
a multimeter connected across
desired.
J6-21
Return tem-
higher than
-
ture
Be sure that flow and return
-
ture sensors resistances using
a multimeter connected across
JJ-64
-
ture sensor
fault
Reset the boiler. If the error
using a multimeter connected
defective.
is below low
limit
-
the electrical circuit of the build-
is above high
limit
electrical circuit of the building
stabiliser should be used for
connection is
defective
room thermostat not connected.
-
connections are done correctly.
timeout
Remote reset
Switch off and switch on the
not been initialised yet. This
-
of internal
inconsistent
ERROR
CODE
REASON ELIMINATION
-
-
-
error
-
dure has not started by user
within the timeout of 5 minutes.
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