Buderus Logano plus GB402 Installation And Maintenance Instructions Manual page 65

Display Fault
1)
Type code code
V CY 573
V CY 574
V LP 570
Tab. 21 Fault displays
1) V = interlocking; B = blocking
Logano plus GB402 - Subject to technical modifications!
Cause Description
Flow The control unit
temperature receives unrealistic
values from the
< -5 °C
flow temperature
(interruption).
sensor.
Flow The control unit
temperature receives unrealistic
values from the
> 130 °C
flow temperature
(short circuit).
sensor.
Too many Too many resets
resets via the were carried out
interface. via the interface
within a certain
period.
Please note: this
fault can only be
reset via the button
on the SAFe.
Test procedure/cause
Check cabling between
SAFe and flow temperature
sensor.
Check electrical
connection of the SAFe
cable.
Check resistance values of
temperature sensor
according to table.
Check voltage at the
temperature sensor
terminals inside the SAFe
according to table.
Check cabling between
SAFe and flow temperature
sensor.
Check electrical
connection of the SAFe
cable.
Check resistance values of
temperature sensor
according to table.
Check voltage at the
temperature sensor
terminals inside the SAFe
according to table.
Faults have been
repeatedly reset but not
removed.
The BC10 has developed a
fault causing constant
resets.
The SAFe has developed a
fault.
10
Troubleshooting
Action
Replace cable if
required.
Remedy contact
problem if required.
Replace temperature
sensor if required.
Replace SAFe if
resistance values of the
temperature sensor are
correct, but voltage
values are incorrect.
Replace cable if
required.
Remedy contact
problem if required.
Replace temperature
sensor if required.
Replace SAFe if
resistance values of the
temperature sensor are
correct, but voltage
values are incorrect.
Identify the cause for the
faults that have resulted
in the resets and remove
them.
Replace the BC10.
Replace the SAFe.
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