SciCan STATIM 2000 Service Manual page 186

8. Water Pumps, Reservoir, and Compressor
96-108639 Rev 3.0
Troubleshooting "WATER QUALITY NOT
ACCEPTABLE" message
Where water quality is known and measured in the reservoir to be below 5 ppm totally
dissolved solids or conductivity of less than 10 μS/cm, but the above message is displayed,
proceed as follows.
In some STAT IM units fitted with water quality sensors, (typically with revision 2.x/5.x controller
boards), there may be a case where electro magnetic interference (when the unit/pump gets older)
affects the accuracy of the sensor and the "WATER QUALITY NOT ACCEPTABLE" message
appears in the LCD display even though nothing is actually wrong with the water. This is rare,
but can occur in units prior to those with revision 6.x controller boards onwards. After this, a
grounding spring was fitted to the pump and shielding was fitted to the sensor cabling which
alleviated the problem.
If this situation occurs, there are three things that can be done:
Option 1. Reverse the polarity of the pump by switching the black and white power leads on
the pump side.
Figure 19
Option 2. Fit a grounding spring to the pump.
To fit a grounding spring, proceed as follows (see Figure 20):
Figure 20
STAT IM 2000/2000S
STATIM 2000/2000S/2000 G4 Service Guide
Service Guide
Page 184