Watts R24-12-1111000 - Manual (Page 23)

III. SERVICE AND MAINTENANCE
The 3501 Reverse Osmosis Controller is designed for ease of maintenance and
minimum service. Since the highest quality of electronic semiconductor
components are used in this design, it is not likely that circuit malfunctions or
failures will occur. It is our recommendation that service be limited to identifying
malfunctions at the board level and that component level troubleshooting be
referred to the factory.
Field failures that most frequently occur are:
- Improper or broken wiring connections
- Incorrect wiring of the motor starter
- Improper grounding
- Cable run is too long
- Water in connectors
- Dirty probes
- Defective probes
A. Troubleshooting
Description of Problem Possible Cause or Solution
System shuts down on low pressure but
pressure is okay. 1. Check the pressure switch set point
2. Possible short in wiring to pressure switch
3. Defective pressure switch
4. Orifice in pressure switch may be plugged
Pressing the Start/Stop button does not turn the
system on. 1. Verify that the key switch is on
2. Verify that the circular connector on the
bottom of the controller is attached
3. Check the fuse in the power inlet
Conductivity monitor does not display the
proper reading. 1. Calibrate the controller
2. Check the wiring to the conductivity probe
3. Clean the conductivity probe
4. Replace the conductivity probe
Erratic conductivity display 1. Conductivity probe wiring may be too
close to high voltage lines.
2. Check for moisture in the connection
between the probe and the lead wire.