CTEK MXS 25 User Manual

Trouble Shooting Guide 1
XS 0.8
• No LED is lit when the charger is connected only to the battery
Explanation: The plug has to be connected for the LED’s to be lit.
• No LED is lit when the charger is connected only to the power outlet
Explanation: One of the LED’s in the bottom row should light up when the
charger is connected to the power outlet.
Test: Make sure that there is power from the power outlet.
• 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 the top row on is indicating charging status.
Explanation: The battery voltage could be under 2±0.5V.
Test: Test the charger on a fresh battery.
• is flashing
If no battery or if the battery voltage is too low the led will start to flash to
indicate the unit has entered power save mode.
Test: Test the charger on a fresh battery.
• 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 charger is not connected to a 12V battery.
Test: Test with a fresh 12V battery.
Explanation 4: The charge cycle is interrupted in step 1.
Test: Test to restart the charge cycle, if it still fails in step 1 the battery is
sulphated and needs to be replaced.
Explanation 5: The charge cycle is interrupted in step 4.
Test: Test to restart the charge cycle, if it still fails in step 4 the battery is can’t
be charged and needs to be replaced.

CTEK MXS 25 Specifications

General

Input voltage	220-240 V
Input frequency	50/60 Hz
Battery voltage	12 V
Operating temperature (T-T)	-20 - 50 °C
Number of batteries supported	-
Product color	Black, Silver

Weight and Dimensions

Depth	235 mm
Width	130 mm
Height	65 mm
Weight	1900 g

Summary

Troubleshooting CTEK XS 0.8

Troubleshooting CTEK XC 0.8

Troubleshooting CTEK XS 800

Troubleshooting CTEK MXS 3.6 / MULTI XS 3600 / Zafir 45 / M45

Troubleshooting CTEK MXS 5.0 Series

Troubleshooting CTEK MXS 7.0 Series

LED Flashing for 4 Hours, Then Error Mode

Battery too sulphated to revive.

Troubleshooting CTEK MXT 4.0 / MULTI XT 4000

Troubleshooting CTEK MXS 10

Troubleshooting CTEK MXS 25 / MULTI XS 25000

Troubleshooting CTEK M200 / M300

Troubleshooting CTEK MXT 14 / MULTI XT 14000

LED Lit for 4 Hours, Then Error Mode

Voltage not increasing: large battery, high loads, or defective cell.

LED Flashing, Then Error Mode

Battery too sulphated to revive.

LED Lit, Then Error Mode

Problem detected during analysis phase.

Troubleshooting CTEK MXTS 70

Troubleshooting CTEK D250S Dual

Charger Does Not Start Charging

Requires sufficient supply and target battery voltage, and higher solar than alternator voltage.

Charger Does Not Stop Charging Target Battery Even Though Supply Battery Turned Off

Output power depends on input voltage; may take time to turn off.

Indicator LED is Flashing

Indicates detected problem, e.g., high temperature or connection issue.

Troubleshooting CTEK SmartPass

SmartPass Does Not Start Charging

Requires sufficient supply voltage and target battery voltage.

SmartPass Does Not Stop Charging Target Battery Even Though Supply Battery Turned Off

SmartPass turns off when voltage drops below 12.8V.

SmartPass Does Not Supply Consumers from Consumer Battery

SmartPass Status LED is Lit