No LED’s are lit on the top row when the charger is connected to both the power outlet and the battery
×
The LED’s on the bottom row are lit and you can change charging mode. None of the LED’s in the top row, indicating charging status, are lit.
Explanation: The battery voltage could be under 2 +/- 0.5V.
Test: Try to charge the battery in Supply mode for approximately 5 min. Then try regular charging.
Test: Test the charger on a fresh battery.
Temperature LED 
is flashing
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Explanation: The temperature is above + 65 °C. The charging is interrupted. Press the MODE button to restart charging when the temperature has dropped below + 65 °C.
The error LED is lit
×
Explanation 1: Reverse polarity.
Test: Make sure that the + cable/clamp is connected to the + terminal and the – cable/clamp is connected to the – terminal.
Explanation 2: Loads are connected to the battery which requires more power than the charger can provide.
Test: Turn off or disconnect the loads when charging.
Explanation 3: The clamps are short circuited in Supply mode.
Test: Separate the clamps.
No LED is lit when the charger is connected only to the power outlet
×
Explanation: One of the LED’s at the lower row should light up when the charger is connected to the power outlet.
Test: Make sure that there is power from the power outlet.
Temperature LED is lit
×
Explanation Multi XS 25000: DC interruption or short circuit in the cable.
Explanation MXS 25: This is normal, the LED is on indicating that the temperature sensor is activated. If the LED is turned off here is a DC interruption or short circuit in the cable.
Temperature LED is lit
×
This is normal, the LED is on indicating that the temperature sensor is activated.
The charger has gone into maintenance mode but cannot see that the recond is completed?
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The Recond program starts with the normal charging program but has a recondition phase inserted after the charging, automatically followed by the maintenance mode. The Recond light “R” on the upper row may be tricky to see, as it will be lit after the third charging lamp, and turns off after the recondition is done, (lasts 0,5h – 4h) and after that the 4th, green maintenance light will be lit.
is flashing, then turns into error mode 
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Explanation: The battery is probably too sulphated to revive. The battery is faulty and it is time to change it.
is lit and then turns into error mode
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The analysis phase is testing if the battery can retain the charger given.
Explanation 1: Large loads are connected to the battery and are draining the voltage.
Test: Disconnect the battery and try charging again.
Explanation 2: The battery cannot retain the charge given.
Test: The battery needs replacing.
No LED is lit when the charger is connected only to the battery
×
Explanation: The plug has to be connected for the LED to be lit.