Buderus Logano plus GB312 Installation Manual page 89

Fault 8Y/590 (locking)
Cause: pressure switch in safety sequence has tripped.
Is the required gas supply
pressure available across
complete burner modulation
range (30-100%)?
check high pressure switch
(available separately)
air supply and flue pressure
switch while burner is OFF.
Is there clear
passage on all
pressure
switches?
Perform reset!
Check which pressure switch cuts
out when burner is running
Fig. 70 Fault elimination sequence 8Y/590
Logano plus GB312 - Technical specifications are subject to change without prior notice
no
yes
no
Replace the
pressure switch
which has cut
out!
yes
High pressure
switch cuts out!
Air supply pres-
sure monitor
Flue pressure
monitor cuts out!
Description: cut-out in pressure switch safety sequence
during burner operation.
Eliminate cause!
check low pressure
switch (available
separately).
Perform reset!
Replace gas
Check air supply
pipe for blockage!
cuts out!
Check flue pipe for
10
Troubleshooting
Perform reset
valve!
blockage!
7 747 010 719-93.3RS
89