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Chapter 9 Troubleshooting 
This  section  describes  many  common  symptoms,  with  suggestions  as  to 
what to do. 
Display blank, transducer not firing. 
Check power supply, voltage 
selector switch and fuse. 
Check wiring to transducer. 
There is a fault with the 
transducer wiring, so check 
wiring to transducer. 
Incorrect  reading  being  displayed  for 
current level. 
Measure actual distance from 
transducer head to surface of 
material. Enter Program Mode 
and directly access P21 (Set 
Distance) type in the measured 
distance, ENTER, ENTER 
again when prompted, wait 
until SET displayed and return 
to Run Mode, display should 
now update to correct reading.  
Material level is consistently  incorrect 
by the same amount. 
Check empty level, (P105) 
display offset, (P802) and 
measurement offset (P851). 
LED’s  change colour at relevant relay 
switch points but relays do not change 
state. 
Check supply to unit and 
ensure voltage selector set to 
correct position.