Buderus GB402-320-5, Installation And Maintenance Instructions For Contractors

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