Buderus LOGANO PLUS GB312 Installation Instructions Manual page 59

Display
1)
Type code Fault code
L 8Y 591
L 9Y 500
501
502
503
L CY 566
L CY 567
L CO 568
Table 22 Fault messages
1) V = locking; B = inhibiting; BC = operating code
Logano plus GB312 – 6 720 647 367 (2012/11)
Cause Description
Error checking safety SAFe pressure switch
assembly. has not tripped.
Internal SAFe relay fault. Internal electronic fault
on SAFe.
Return temperature The control unit receives
unrealistic values from
< 23 °F (< -5 °C)
the return sensor.
(circuit break)
Return temperature Control unit is receiving
implausible signals from
> 266 °F (> 130 °C)
return sensor.
(short circuit)
Water pressure sensor fault Water pressure sensor
(break in cable). circuit break (voltage
> 3.5 V)
Troubleshooting
Testing sequence/
Cause Measure
Check whether gas Ensure gas supply
supply pressure is pressure is
> 3 inches w.c. > 3 inches w.c.
Check setting of SAFe Adjust setting of SAFe
pressure switch. pressure switch to
3 inches w.c.
Check connector on gas Insert connector
valve is properly seated. properly.
Replace SAFe pressure
switch and wiring.
Replace SAFe.
Press Reset button and If fault recurs after reset,
wait to see if fault is SAFe must be replaced.
eliminated.
Check cabling between Replace connecting lead
SAFe and return sensor. if necessary.
Check electrical Rectify any contact
connection of connecting problems.
lead to SAFe.
Check resistance levels of Replace temperature
temperature sensor sensor if necessary.
against table.
Check voltage at If temperature sensor
temperature sensor resistances are correct
terminals on SAFe against but voltages incorrect,
table. replace SAFe.
Check cabling between Replace connecting lead
SAFe and return sensor. if necessary.
Check electrical Rectify any contact
connection of connecting problems.
lead to SAFe.
Check resistance levels of Replace temperature
temperature sensor sensor if necessary.
against table.
Check voltage at If temperature sensor
temperature sensor resistances are correct
terminals on SAFe against but voltages incorrect,
table. replace SAFe.
Check connection Establish good electrical
between SAFe and water contact. Replace lead if
pressure sensor for poor necessary.
contact, breaks and
damage.
Check water pressure Replace water pressure
sensor. sensor.
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