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T-Product · BCU 465 · 2006 April
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Troubleshooting
Fault lockout
In the event of a fault lockout, the
BCU will stop power to the gas
valves and the ignition transformer.
The fault signal contact terminal #18/
#19 closes and the display flashes
indicating the current program sta-
tus. The fault signal contact opens
in the event of a main power supply
failure.
Reset
After a fault lockout, the burner con-
trol unit can be reset, either using the
button on the front of the unit or by
using a remote reset. Several burner
control units can be reset in paral-
lel via the remote reset. The BCU
cannot be reset by a main power
supply failure.
Note:
The BCU can only be reset
when the display is flashing, not
when the flame signal or a param-
eter is being displayed. In this case
press the Reset/Info button until the
display starts to flash.
Note:
If the BCU does not respond
even though all faults have been cor-
rected, – remove unit and return it to
the manufacturer for inspection.
Assistance in the Event of
Malfunction
Caution!
•
Electric shocks can be fatal!
Disconnect electrical cables
from the power supply be-
fore working on live compo-
nents!
• Fault-clearance by authorized,
trained personnel only!
• Do not repair the BCU, as this
will void our warranty. Improper
repair or incorrect electrical
connections, e.g. the connec-
tion of power to outputs, can
cause gas valves to open and
the BCU to become defective.
In this case, reliable operation
can no longer be guaranteed.
• (Remote) reset only by author-
ized personnel with continuous
monitoring of the burner to be
repaired.
• Faults may be cleared only us-
ing the measures described
below.
