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