I have a MultiPlus unit that is stuck in Bulk Charge, but when measured the current is zero and the battery appears to be at Float Voltage. The unit does not achieve a higher voltage and certainly does not constant current charge? There are no fault lights and the unit operates as expected otherwise. The unit is used with flooded traction type cells so we ideally need to restore Bulk and Absorbtion charging as the battery performance is decreasing. Thanks.