Buderus Logano plus GB402 Installation And Maintenance Instructions For Contractors page 54

11 Troubleshooting
1)
Type Display code Fault Code
V LL 571
V EE 601
V EE 612
V EE 613
Table 23 Fault displays
1) V = locking; B = blocking
54
Reason Description:
Too many restarts 15 restarts have
despite resets. occurred in direct
succession. This means
that the same problem
persisted after the
resets.
Please note: this fault
can only be reset via
the button on the SAFe.
Flow temperature Successive
sensor measurements of the
measurement. flow temperature
deviate severely from
each other.
Return Successive
temperature measurements of the
sensor return temperature are
measurement. too widely divergent.
Flow temperature Successive
sensor reading measurements of the
flow temperature
deviate severely from
each other.
Test procedure/cause
Faults present have been
repeatedly reset but not
eliminated.
Check the boiler sensor lead.
Check the plug-in connector.
Check the sensor values against
the table.
Check the voltage at the
temperature sensor according to
table.
Check the boiler sensor lead.
Check the plug-in connector.
Check the sensor values against
the table.
Check the voltage at the
temperature sensor according to
table.
Check resistance value of the
flow temperature sensor.
Logano plus GB402 – 6 720 820 700 (2018/01)
Corrective measure
Identify the cause of the faults,
which have resulted in the
resets, and eliminate them.
Replace if damaged.
Clean if dirty or replace if
necessary.
Refit plug it is found to be
loose.
Replace the temperature
sensor if there are any
deviations from the table.
Replace the SAFe in case of
deviations.
Replace if damaged.
Clean if dirty or replace if
necessary.
Refit plug it is found to be
loose.
Replace the temperature
sensor if there are any
deviations from the table.
Replace the SAFe in case of
deviations.
Replace flow temperature
sensor in case of deviations.