The reason for the message is that the change in analogue output from the scale base between zero calibration and the span calibration value is too small.

The most likely reason is that the amount of weight placed on the scale for span calibration is too small – the minimum value should normally be around 50kg or 120 lbs.

Other less likely reasons could be:

• The load cell cable from the scale base junction box to the indicator is disconnected, cut, or damaged


• Doing a span calibration without putting weights on to the scale


• Doing the zero calibration with weights sitting on the scale


• Failed load cell


• Mechanical bind under the scale preventing the full load being detected by all four load cells.