Troubleshooting Safety Sequence/Pressure Switch - Buderus LOGANO PLUS GB312 Installation Instructions Manual

10
Troubleshooting

10.3 Troubleshooting safety sequence/pressure switch

Fault 8L/579 (locking)
Cause: no gas supply pressure/safety sequence pressure switch cut out.
Is the main gas cock turned
on and is gas pressure
present?
Is the low pressure switch
setting (natural gas: 3 inches
w.c., propane: 7 inches w.c.)
correct?
Is continuity
OK on SAFe
pressure
switch?
Check high pressure
switch (available separately),
air supply monitor and flue
gas monitor for clear passage
with the burner off.
Is there clear
passage on all
pressure switches?
Switch boiler OFF
and ON again on
controller!
Does Fault
8L / 579 recur?
Replace low
pressure switch
(available separately)
Fig. 74 Fault elimination sequence 8L/579
62
no
yes
no
Correct setting!
yes
Turn on manual gas
no
isolating cock upstream
of Venturi!
Check gas valve
connector is making
proper contact!
yes
no
Replace the
pressure switch
that has tripped!
yes
Description: there is no gas pressure present / a pressure switch in the
safety sequence has tripped.
Turn on the main
gas cock!
Switch boiler OFF
and ON again on
controller!
Switch boiler OFF
and ON again on
controller!
Switch boiler OFF
and ON again on
controller!
Switch boiler OFF
and ON again on
controller!
Logano plus GB312 – 6 720 647 367 (2012/11)