Buderus Logano plus GB402 Installation And Maintenance Instructions For Contractors page 53

1)
Type Display code Fault Code
V CY 573
V CY 574
V LP 570
Table 23 Fault displays
1) V = locking; B = blocking
Logano plus GB402 – 6 720 820 700 (2018/01)
Reason Description:
Supply The control unit
temperature receives unrealistic
values from the flow
< -5 °C
temperature sensor.
(interruption)
Supply The control unit
temperature receives unrealistic
values from the flow
> 130 °C (short
temperature sensor.
circuit)
Too many resets Too many resets were
via the interface. carried out 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 the resistance values of the
temperature sensor against the
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 the resistance values of the
temperature sensor against the
table.
Check voltage at the temperature
sensor terminals inside the SAFe
according to table.
Faults present have been
repeatedly reset but not
eliminated.
The BC10 has developed a fault,
which is causing constant resets.
The SAFe has developed a fault.
Troubleshooting 11
Corrective measure
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 of the faults,
which have resulted in the
resets, and eliminate them.
Replace the BC10.
Replace the SAFe.
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