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The One Series Electronic Pressure, Differential Pressure and Temperature Switches are designed
for simple installation and programming, providing years of trouble-free and reliable service. In
the event that the One Series appears to be malfunctioning, please refer to this Troubleshooting
Guide, matching the symptom to the recommended solution. If the symptom cannot be found in
this Guide or the solution does not correct the malfunction, please call United Electric Controls
Technical Support at (617)926-1000. Our representatives will help you to determine if there is
a problem with your One Series that requires service.
Troubleshooting
A. There appears to be no power
Intent: To locate power supply, interconnection, or One Series fault.
Question
Answer
Direction
1. Has the unit ever functioned?
Yes
Go to step A2
No
Go to step A5
2. Is the LCD display functioning?
Yes
The unit has power.
Go to step A4
No
Go to step A3
3. Is the switched output status
Yes
The unit has power.
LED ON or flashing?
Done
No
Go to step A4
4. Using the voltmeter, is the incoming
Yes
The unit has power. Done
power supply level between 18 & 30 Vdc?
No
Go to step A5
(See Wiring Diagrams)
5. Turn off all power to the unit and check
Yes
Go to step A6
connections for the incoming power supply
No
Go to step A6
wires. Are they correct and secure? (See Wiring Diagrams)
6. Restore power to the unit. Ensure supply
Yes
Done
voltage is between 18 and 30 VDC. Do the LCD
No
Contact
display and/or switched output status LED illuminate?
United Electric Controls or
their authorized Distributor
for further assistance.
Содержание ONE Series
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