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Nefit B.V. • http://www.nefit.nl
Operating manual ModuLine 300 • edition 12/2010
Technical specifications are subject to change without prior notice.
Remedy malfunctions9
A12 815
Sensor distributor
module malfunction.
Sensor wrongly connected
or incorrectly installed.
Breakage or short circuit of
the sensor cable.
Sensor defect.
Check sensor connection and cable.
Check the attachment of the sensor.
Compare the resistance values with
the characteristics of the sensor.
A12 816
No communication
with the distributor
module.
No communication via the
bus line.
Check the wiring of the bus line.
Replace distributor module.
A15 816
No communication
with WTW.
A15 844
Clean filters WTW
A18 825
Two modules
connected.
Room thermostats assigned
to the wrong heating circuit.
Assign room thermostats to the correct
heating circuit.
A2x 816
No communication
with room thermostat
CH-"x".
A3x 807
Flow sensor CH-"x"
indicated malfunction.
Sensor wrongly connected
or incorrectly installed.
Breakage or short circuit of
the sensor cable.
Sensor defect.
Check sensor connection and sensor
cable.
Check the attachment of the sensor.
Compare the resistance values with
the characteristics of the sensor.
A3x 816
No communication
with mixer module
CH-"x".
Incorrect communication via
the bus line.
Check the wiring of the bus line.
Replace mixer module.
A51 816
No communication
with solar cylinder.
Deactivate the solar cylinder module in
the service menu (Æ paragraph 8.5,
page 27).
Service-
code
Error-
code
Malfunction Possible causes Solution
Table 5 Remedy malfunctions (for installer)
30


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