Fault 8Y/590 (locking)
Cause: pressure switch in safety sequence has tripped.
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. 75 Fault elimination sequence 8Y/590
Logano plus GB312 – 6 720 647 367 (2012/11)
no
yes
no
Adjust setting
to 3 inches w.c.
yes
no
no
no
Description: cut-out in pressure switch safety sequence during burner
operation.
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!
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