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Unusually long
charging time. The
yellow “Batt. I” LED
flashes.
High temperature protection of the house
battery. The charging 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 charging booster returns automatically to
full charging voltage and current when the
temperature drops to the restart value
(<48 °C).
Only LiFePO4 batteries: Low temperature
protection of the house battery. The
charging booster switches to reduced
charging voltage (12.8 V) and the maxi-
mum charging current is halved when the
temperature of the battery drops below
the cutoff value (< –20 °C).
➤
Move the battery to a warmer location.
The charging booster restarts automatically
when the temperature exceeds the restart
value (> –18 °C)
Unusually long
charging time. The
yellow “Batt. I” LED
flashes slowly.
Only LiFePO4 batteries: Low temperature
protection of the house battery. The
charging booster switches to reduced
charging current when the temperature of
the battery drops below the cutoff value
(< 0 °C).
➤
Move the battery to a warmer location
(>0 °C).
The charging booster restarts automatically
when the temperature exceeds the restart
value (>0 °C).
Unusually long
charging time. The
yellow “Batt. II” LED
flashes.
Low voltage protection of the starting bat-
tery. Battery voltage too low (> set value
for “increase of charging power”, see
chapter “Setting the operating mode” on
page 21). The charging booster switches
to reduced charging current (<30 %) to
protect the battery.
The charging booster returns automatically to
full charging current when the voltage rises to
the restart value (set value for “reduction of
charging power”, see chapter “Setting the
operating mode” on page 21).
The charging booster
stops the charging
process. The red
“Power” LED flashes.
Shutdown by safety timer. The I phase has
lasted too long (>15 h).
➤
Reset the device by removing the control
signal at D+. Switch off the motor and dis-
connect the device from the mains.
Too many DC loads connected.
➤
Reduce the connected DC loads.
The battery is defective.
➤
Replace the battery.
Overheating of the charging booster.
The charging booster restarts automatically
when the temperature drops.
Reversed polarity of the house battery.
➤
Connect the house battery with the correct
polarity.
Full charging current
is not reached. The
red “Power” LED is lit.
The house battery is already charged.
➤
Load with powerful consumers.
The charging current is not set correctly.
➤
Check the setting of the charging current
(see chapter “Setting the operating
mode” on page 21).
The battery is significantly sulfated.
➤
Replace the battery.
Hidden cutoff relay present (e.g. in the
central electrical system).
➤
Adapt connection variant for vehicles with
an existing cutoff relay.
Fault
Possible cause
Suggested remedy
