Buderus Logano plus GB402 Installation And Maintenance Instructions Manual page 64

10
Troubleshooting
Display Fault
1)
Type code code
V 9Y 500
501
502
503
V CY 566
V CY 567
V CO 568
V CO 569
Tab. 21 Fault displays
1) V = interlocking; B = blocking
64
Cause Description
Internal SAFe Internal SAFe
relay faulty. electronics faulty.
Return The control unit
temperature receives unrealistic
values from the
< -5 °C
return sensor.
(interruption).
Return The control unit
temperature receives unrealistic
values from the
> 130 °C
return sensor.
(short circuit).
Water Water pressure
pressure sensor interruption
sensor fault (voltage > 3.5 V).
(cable break).
Water Water pressure
pressure sensor short circuit
sensor fault (voltage < 0.5 V).
(short circuit).
Test procedure/cause
Press "Reset" and wait to
see if the fault has been
removed.
Check cabling between
SAFe and return 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 return 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 lead to water
pressure sensor.
Check water pressure
sensor.
Check lead to water
pressure sensor.
Check water pressure
sensor.
Logano plus GB402 - Subject to technical modifications!
Action
Replace the SAFe if the
fault persists after
"Reset" has been
pressed.
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.
Remedy any
interruption.
Replace water pressure
sensor.
Remedy any short
circuit.
Replace water pressure
sensor.