Buderus Logano plus GB402 Installation And Maintenance Instructions Manual page 49

Display
1)
Type code Fault code
B 8L 534
V 8P 580
V 8U 581
V 9Y 500
501
502
503
V CY 566
V CY 567
V CO 568
V CO 569
Tab. 22 Fault displays
1) V = locking; B = blocking
Logano plus GB402 – 6 720 804 428 (2012/09)
Cause Description
No gas pressure There is no gas
or additional flue pressure although
gas pressure solenoid valve 1 should
limiter (pressure have opened. The
> 7.5 bar) has burner makes three
responded. successive attempts at
starting, then there is a
delay of one hour,
before making three
more start attempts.
Solenoid valve 1 The valve test system
leaking has detected an
unacceptably high
leakage rate on
solenoid valve 1.
Solenoid valve 2 The valve test system
leaking has detected an
unacceptably high
leakage rate on
solenoid valve 2.
Internal SAFe Internal SAFe
relay faulty. electronics faulty.
Return The control unit
temperature receives unrealistic
values from the return
< -5 °C
sensor.
(interruption)
Return The control unit
temperature receives unrealistic
values from the return
> 130 °C (short
sensor.
circuit)
Water pressure Water pressure sensor
sensor fault interruption (voltage
(cable break). > 3.5 V).
Water pressure Water pressure sensor
sensor fault short circuit (voltage
(short circuit). < 0.5 V).
Test procedure/cause
Check that the gas tap is open.
Check whether there is gas
pressure.
Check whether the flue gas
pressure limiter has responded.
Check electrode.
Check ignition transformer.
Check gas filter for
contamination.
Check gas train for
contamination.
Gas filter fitted.
Check gas train for
contamination.
Gas filter fitted.
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.
Troubleshooting 10
Correction
Replace the gas train if
required.
Check the gas pressure.
Reset the flue gas pressure
limiter.
Check the flue gas path for
blockages.
Replace electrode if required.
Replace ignition transformer if
required.
Replace gas filter if required.
Replace gas train.
Replace gas train.
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.
49