Error Lamp; Maintenance Instructions - CTEK MUS 4.3 Manual

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ERROR LAMP

If the error lamp is lit, check the following:
1. Is the chargers positive lead connected
to the battery's positive pole?
2. Is the charger connected to a 12V
battery?
3. Has charging been interrupted in STEP
1, 2 or 5?
Restart the charger by pressing the MODE-
button. If charging is still being interrupted, the 
battery...
STEP 1: ...is seriously sulfated and may need to 
be replaced.
STEP 2: ...can not accept charge and may 
need to be replaced.
STEP 5: ...can not keep charge and may need 
to be replaced..
20016551B MUS 4.3 NG, Manual, Print file 002.indd 11
MAINTENANCE
INSTRUCTIONS
The MUS 4.3 (1065) is maintenance-free. The charger must 
not be opened; doing so will invalidate the warranty. If the 
power cable is damaged the charger must be returned to the 
retailer. The charger casing can be cleaned using a damp 
cloth and mild cleaning agent. Remove the plug from the 
power socket before cleaning. 
 EN • 11
2011-12-02 14:21:22

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Russell T Schneider
May 6, 2025

When does the charger switch from 7 to 8 (float to pulse) and why?

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