Dometic BUTTNER MT BCB25/20, Installation And Operating Manual

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Troubleshooting
Fault Possible cause Suggested remedy
The battery control booster
does not work. The green
“Power” LED does not light
up. Insulation faults, breaks or loose con-
nections at the live cables.
➤
Check live cables for insulation faults,
breaks or loose connections.
If you cannot find an error, contact an
authorized service agent.
Short circuit has been generated. The device fuse must be replaced by an
authorized service agent after it has been
triggered by excess current.
The battery control booster
does not work. The yellow
“Main Charging” LED
flashes. Over voltage protection of the house
battery. Battery voltages too high
(>15.5 V).
➤
Reduce the connected voltages.
The battery control booster restarts auto-
matically when the voltage drops to the
restart value (<13.2 V).
Connection of defective charging sys-
tems.
➤
Check and remove defective
charging systems if necessary.
Only LiFePO4 batteries: Temperature
sensor is not connected.
➤
Connect the temperature sensor.
Unusually long charging
time. The yellow “Batt. I” LED
flashes slowly. High temperature shutdown: The bat-
tery control booster switches to
reduced charging voltage (12.8 V) and
the maximum charging current is
halved when the temperature of the
battery exceeds the cutoff value
(>50 °C).
➤
Check that the air inlets and outlets are
not covered or obstructed.
➤
Allow the battery to cool down.
The battery control booster returns auto-
matically to full charging voltage when the
temperature drops to the restart value
(<48 °C).
Low temperature shutdown (only for
LiFePO4 batteries): The battery control
booster switches to reduced charging
voltage (12.8 V) when the temperature
of the battery drops below the cutoff
value (< 20 °C).
➤
Move the battery to a warmer loca-
tion.
The battery control booster returns auto-
matically to full charging voltage when the
temperature exceeds the restart value
(>18 °C).
Unusually long charging
time. The yellow “Batt. I” LED
flashes quickly. Low temperature protection (only for
LiFePO4 batteries): The battery control
booster switches to reduced charging
current when the temperature of the
battery drops below the cutoff value
(< 0 °C).
➤
Move the battery to another location
(>0 °C).
The battery control booster restarts auto-
matically when the temperature exceeds
the restart value (>0 °C).
Unusually long charging
time. The yellow “Batt. II”
LED flashes slowly. Low voltage protection: The battery
control booster switches to reduced
charging current (< 30 %) to protect the
battery. The battery control booster returns auto-
matically to full charging current when the
voltage rises to the restart value.