Buderus Logamatic 4323, Service Instructions Manual

Page: 107 / 124

Fault 20
Logamatic 4323 - Subject to technical modifications. 107
Unknown
module x – Module switches all outputs off
and corresponding fault LED on.
– This is a newer module type which
is not recognised by the older
control software.
– Checking the control unit version in
the MEC2 (
Æ
Chapter 22).
If necessary, replace the CM431
and MEC.
– Module or control unit is faulty. – If necessary, replace module or
control unit.
Inert anode – No effects on control
characteristics.
– Inert anode incorrectly connected
or faulty.
– Check the inert electrode and
replace if necessary.
– Module is faulty. – Replace module.
External
Fault input – External components incorrectly
connected or faulty.
– Check connection and function of
external components (cylinder
primary and DHW circulation
pumps).
– Module is faulty. – If necessary, replace the module.
Insuff. supply – Pump logic will be cancelled. – Boiler sensor incorrectly
positioned. Sensor must always be
installed in the heat source.
– Fit boiler sensor in the heat source
or buffer cylinder.
– System may be insufficiently
supplied
– Heat supply insufficient or non-
existant.
– Recharge a wood burning boiler,
for example.
Flow sensor
FZB – Pump logic will be cancelled. – Sensor is faulty or not connected. – Check sensor connection.
If necessary, replace the sensor.
– Sensor should not be required, but
is needed because control unit has
been incorrectly set up.
– Check control unit address: Sensor
is required for address 0 or 1 at the
CM431.
With a CAN address <1, a boiler
system is regulated by this control
unit, then parameter Minimum
heat-up temp (
Æ
Chapter 13.1) is
set to "off".
Sensor will only be required for
control unit addresses higher than
1 if boiler rise (
Æ
Chapter 11.22)
higher than 0 has been entered.
– Module or control unit faulty. – If necessary, replace module or
control unit.
Manual mode
XX – Control unit operates in manual
mode.
– A function module switch may not
have been set to "AUT".
– Set the corresponding function
module switch to "AUT".
Maintenance
Date – No influence on control
characteristics.
– The specified period before the
next service has expired.
– Perform maintenance and then
reset maintenance message.
Fault Effect on control
characteristics Possible causes of the fault Remedy
Tab. 4 Fault table