14
ST30 Speed Operation and Installation Handbook
Chapter 3: Fault Finding
All Autohelm products are, prior to packing and shipping, subject to
comprehensive test and quality assurance programmes. However, if a
fault arises with the ST30 Speed, the following table will help to identify
the probable cause and provide the most likely cure.
Fault
Cause
Action
Instrument display
blank
No supply to
instrument
Check supply
Check cabling and
security of connectors
Check circuit breaker
Return ST30 Speed for
repair
No speed information
Transducer cabling
problem or fouled
Clean paddlewheel
No exchange of
information between
SeaTalk instruments
SeaTalk cabling or
connector problem
Check security of
SeaTalk connectors
Remove instruments one
by one to isolate
faulty unit
Failure of a group of
instruments in a chain
Cabling or connector
problem
Check the security of
the connectors between
functioning and
non-functioning
instruments
Unable to enter
calibration
Calibration locked
Refer to Calibration
lock/unlock section
