Buderus Logano plus GB312 Installation Manual page 81

Type Display
1)
code Fault code Cause
V 6L 561
B 7A 550
B 7A 551
Tab. 17 Fault messages
1) V = locking; B = inhibiting; BC = operating code
Logano plus GB312 - Technical specifications are subject to change without prior notice
Description
5 power-up The burner control
sequences (power unit has switched
supply disconnection off 5 times during
during burner start- the burner start-up
up). sequence.
Voltage too low. The power supply
voltage is too low.
Power failure. There has been a
brief loss of power.
Troubleshooting
Testing
sequence/Cause Action
(continued from
previous page)
SAFe burner con- Replace SAFe.
trol unit defective.
Ignition transformer Replace ignition
defective (delayed transformer.
or non-existent
spark, "violent" start-
tup).
Check the 120V Reset burner con-
power supply to the trol unit.
control unit.
Rectify power sup-
ply problem.
The power supply Ensure adequate
voltage must not power supply volt-
drop below 102V. age.
Check power supply Rectify any contact
lead for loose con- problems.
tacts.
Check wiring and
proper contact of
power plug on
MC10/SAFe.
10
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