Buderus LOGANO PLUS GB312 Installation Instructions Manual page 64

10
Troubleshooting
Fault 8Y/591 (locking)
Cause: Error checking safety assembly.
Is the required gas supply
pressure of > 3.5 inches w.c.
present?
Check setting of SAFe
pressure switch
(should be 3 inches w.c.)!
Is pressure
switch setting
correct?
Perform reset!
Does MV1 (see LED of the gas
valve) open before error
message?
Does burner start up?
Does burner start up?
Fig. 76 Fault elimination sequence 8Y/591
64
no
yes
no
Adjust setting
to 3 inches w.c.
yes
no
no
no
Description: SAFe pressure switch has not responded during safety
check.
Eliminate cause!
Perform reset!
Check gas
valve connector
is in proper contact.
Replace SAFe
pressure switch.
Replace SAFe!
Logano plus GB312 – 6 720 647 367 (2012/11)
Perform reset!
Perform reset!
Perform reset!
Perform reset!