Buderus Logano plus GB312 Installation And Service Instructions Manual page 63

Faults 8Y/591 (interlocking)
Cause: faults when checking the safety sequence.
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. 71 Troubleshooting procedure 8Y/591
Logano plus GB312 – 6 720 806 273 (2013/01)
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!
10
Troubleshooting
Perform reset!
Perform reset!
Perform reset!
Perform reset!
63