Buderus Logamatic 4321, Operating Instructions Manual

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Correcting faults and troubleshooting 11
Logamatic 4321/4322 - Technical specifications are subject to change without prior notice. 73
11.2 Troubleshooting
Fault Effect Remedy
Burner fault Heating remains cold.
– Service burner as described in the boiler or burner
documentation.
Boiler remains cold
Heating remains cold in
some cases but not always.
– Check that the temperature control is set to AUT .
– Check that sufficient fuel is available.
If not successful:
– Set burner emergency switch on control to manual
mode.
– Set the burner manual switch on the ZM432 module
to
max/I+II , and set the boiler water temperature
using the thermostat.
– Notify heating contractor.
DHW temperature does
not rise DHW remains cold in some
cases but not always.
– Check that the temperature control is set to AUT .
If not successful:
– Set DHW and heating zone manual switch on the
FM441 module to manual mode.
– Notify heating contractor.
Safety chain has tripped Heating remains cold.
– Check that the boiler is completely full of water.
Check whether the boiler is under at least 14.5 psi
(1.0 bar) pressure.
If this is the case:
– Unlock the safety temperature switch by unscrewing
the cap nut and pressing the reset button under it.
If not successful:
– Notify heating contractor.
Remote control fault
The control operates with
the last values set at the
remote control.
– Notify heating contractor.
Boiler sensor fault;
Outdoor temperature
sensor fault;
Flow sensor fault
The heater heats at higher
temperatures if necessary
and in order to ensure a
comfortable temperature.
– Notify heating contractor.
Inform the heating contractor which temperature
sensor is defective.
DHW sensor fault
If the DHW sensor is
defective, water is not
heated for safety reasons.
– Notify heating contractor.
Heating zone X
in manual mode;
DHW in manual mode;
Boiler loop in manual
mode;
Burner in manual mode
Pumps, actuators etc. are
manually switched
depending in the switch
positions.
The control functions
continue operating during
manual mode but do not
affect the system.
– The switches are set to manual mode (for servicing
or to correct errors).
Return the manual switches to AUT when faults
have been remedied.
Tab. 4 Troubleshooting