Nefit ModuLine 300 Operating Manual page 30

9 Remedy malfunctions
Service- Error-
code code
Sensor distributor
A 1 2 8 1 5
module malfunction.
No communication
A 1 2 8 1 6
with the distributor
module.
No communication
A 1 5 8 1 6
with WTW.
Clean filters WTW
A 1 5 8 4 4
Two modules
A 1 8 8 2 5
connected.
No communication
A 2 x 8 1 6
with room thermostat
CH-"x".
Flow sensor CH-"x"
A 3 x 8 0 7
indicated malfunction.
No communication
A 3 x 8 1 6
with mixer module
CH-"x".
No communication
A 5 1 8 1 6
with solar cylinder.
Table 5 Remedy malfunctions (for installer)
Nefit B.V. • http://www.nefit.nl
30
Malfunction
– Sensor wrongly connected
or incorrectly installed.
– Breakage or short circuit of
the sensor cable.
– Sensor defect.
– No communication via the
bus line.
– Room thermostats assigned
to the wrong heating circuit.
– Sensor wrongly connected
or incorrectly installed.
– Breakage or short circuit of
the sensor cable.
– Sensor defect.
– Incorrect communication via
the bus line.
Possible causes
Technical specifications are subject to change without prior notice.
Operating manual ModuLine 300 • edition 12/2010
Solution
– Check sensor connection and cable.
– Check the attachment of the sensor.
– Compare the resistance values with
the characteristics of the sensor.
– Check the wiring of the bus line.
– Replace distributor module.
– Assign room thermostats to the correct
heating circuit.
– Check sensor connection and sensor
cable.
– Check the attachment of the sensor.
– Compare the resistance values with
the characteristics of the sensor.
– Check the wiring of the bus line.
– Replace mixer module.
– Deactivate the solar cylinder module in
the service menu (
page 27).
paragraph 8.5,