Buderus Logano plus GB312 Installation Manual page 83

Type Display
1)
code Fault code Cause
V 8Y 590
V 8Y 591
V 9Y 500
501
502
503
Tab. 17 Fault messages
1) V = locking; B = inhibiting; BC = operating code
Logano plus GB312 - Technical specifications are subject to change without prior notice
Description
Pressure switch in Break in pressure
safety assembly has switch safety
tripped. assembly during
burner operation.
Error checking safety SAFe pressure
assembly. switch has not
tripped.
Internal SAFe relay Internal electronic
fault. fault on SAFe.
Troubleshooting
Testing
sequence/Cause Action
Check whether low Measure the gas
gas pressure switch pressure at 100%
(available sepa- boiler modulation.
rately) is breaking
Check low gas
circuit during opera-
pressure switch
tion.
(available sepa-
rately) setting.
Check if the air sup- Check flue/air sup-
ply switch or flue ply pipe for block-
gas pressure switch ages.
opens while the
boiler is operating.
Check whether
Replace gas valve
SAFe or high gas
pressure switch
(available sepa-
rately) is breaking
circuit during opera-
tion
Section 10.3, page
87 ff
Check whether gas Ensure gas supply
supply pressure is pressure is
> 3 inches w.c. > 3 inches w.c.
Check setting of Adjust setting of
SAFe pressure SAFe pressure
switch. switch to 3 inches
w.c.
Check connector on Insert connector
gas valve is properly properly.
seated.
Replace SAFe
pressure switch
and wiring.
Replace SAFe.
Press Reset button If fault recurs after
and wait to see if reset, SAFe must
fault is eliminated. be replaced.
10
83