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Technical specifications are subject to change without prior notice.
Operating manual ModuLine 300 • edition 12/2010
Nefit B.V. • http://www.nefit.nl
Remedy malfunctions 9
9.2 Remedy malfunctions (for installer)
In table 5 are all malfunction codes, which can
be shown by the thermostat. The malfunction
codes can be the result of a failure, or wrong
settings in the thermostat, boiler or modules.
Additional information is described in the
technical documentation of the concerning
product.
Fig. 45 Example of a malfunction
Fout cv-installatie
Geen communicatie
met zonneboilermodule
A51 816
Service-
code
Error-
code
Malfunction Possible causes Solution
A01 808
DHW sensor 1
indicates 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.
A01 809
DHW sensor 2
indicates malfunction.
A01 810
DHW does not get
warm.
DHW was requested
for 4 hours.
Permanent use of DHW, or
a leak.
Sensor wrongly connected
or incorrectly installed.
Breakage or short circuit of
the sensor cable.
Sensor defect.
Repair dripping tap.
Check sensor connection and sensor
cable.
Check the attachment of the sensor.
Compare the resistance values with
the characteristics of the sensor.
A01 816
No communication
with the boiler.
UBA-bus system is
overloaded.
UBA 3/UBA 3.5 is defect.
Reset by turning off/on the heating
system.
If necessary, inform service company.
A01 828
Water pressure
sensor indicated
malfunction.
Digital water pressure
sensor is defect.
Replace water pressure sensor.
A02 816
No communication
with BC10.
Contact problem at the
BC10 or BC10 defect.
Check connection of BC10.
If necessary, replace the BC10.
A11 806
Temperature sensor
ModuLine
malfunction.
A11 816
No communication
with ModuLine 400.
A11 83x
Via ModuLine 400:
activate heating circuit
"x" en choose
ModuLine 300.
Table 5 Remedy malfunctions (for installer)
29


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