Sierra 840 User Manual
Series 830/840/860 Instruction Manual
Chapter 5 Troubleshooting
IM-83/84/86-H
5-1
Chapter 5 Troubleshooting
This chapter is provided to help locate the cause of a transducer
failure. It is not intended to be an all inclusive repair manual. In
the case of major repairs, the unit should be returned to the fac-
tory for service. Contact Sierra Customer Service for return
shipping instructions (page 5-4).
When you suspect that the transducer is not operating correctly,
there are a few simple checks that can be made before dismantling
the unit:
1. Make certain that there are no leaks in the line.
2. Check that all cables are connected and are in good condition.
3. Verify that the power supply is of the correct polarity and
failure. It is not intended to be an all inclusive repair manual. In
the case of major repairs, the unit should be returned to the fac-
tory for service. Contact Sierra Customer Service for return
shipping instructions (page 5-4).
When you suspect that the transducer is not operating correctly,
there are a few simple checks that can be made before dismantling
the unit:
1. Make certain that there are no leaks in the line.
2. Check that all cables are connected and are in good condition.
3. Verify that the power supply is of the correct polarity and
voltage and properly connected to the transducer.
4. For controllers, check for adequate pressure differential across
the controller. Check the valve voltage.
5. Double check connector pin outs when replacing another
manufacturer’s transducer.
After verifying the factors above, follow the troubleshooting proce-
dures outlined on the next page.
Warning!
Always remove main power
before disassembling
the transducer.
Caution!
Only qualified personnel
should perform trouble-
shooting procedures.