Shearwater TERN - 15. Troubleshooting; Warnings and Information Displays

Operating Instructions
Page 64
Doc. 15301-RevB (2023-11-24)
15. Troubleshooting
Follow these guidelines to help solve problems with
the Tern�
15.1. Warnings and Information
Displays
The following table lists warnings and errors and
information alerts you may see, their meaning, and
steps to take to solve any problems�
The highest priority notification is listed first� If multiple
alerts occur simultaneously, the error with the highest
priority will be displayed� Clear that error by pressing
the INFO button to see the next error�
See the Alerts section on page 22 for more
information�
Display Meaning
Action to take
.0
0
ft
MAX
ft
103.6 4:57
STOPWATCH
SURFACE
Deep
19:16
FD
C
L
E
A
R
WARNING
LOW PPO2
The PPO2 is below the
limit set in the PPO2
limits menu�
Change your breathing
gas to one safe for the
current depth.
.0
0
ft
MAX
ft
103.6 4:57
STOPWATCH
SURFACE
Deep
19:16
FD
C
L
E
A
R
WARNING
HIGH PPO2
The PPO2 is above the
limit set in the PPO2
limits menu�
Change your breathing
gas to one safe for the
current depth.
.0
0
ft
MAX
ft
103.6 4:57
STOPWATCH
SURFACE
Deep
19:16
FD
C
L
E
A
R
WARNING
MISSED STOP
A required
decompression stop
was violated�
Descend deeper than
the currently displayed
stop depth. Monitor for
symptoms of DCS. Use
extra conservatism for
future repetitive dives.
.0
0
ft
MAX
ft
103.6 4:57
STOPWATCH
SURFACE
Deep
19:16
FD
C
L
E
A
R
WARNING
FAST ASCENT
The ascent was
sustained as faster than
10m/min (33ft/min)
Use a slow ascent rate.
Monitor for symptoms of
DCS. Use extra conser-
vatism for future repeti-
tive dives.
.0
0
ft
MAX
ft
103.6 4:57
STOPWATCH
SURFACE
Deep
19:16
FD
C
L
E
A
R
WARNING
LOW BATTERY
The internal battery is
low�
Recharge the battery.
.0
0
ft
MAX
ft
103.6 4:57
STOPWATCH
SURFACE
Deep
19:16
FD
C
L
E
A
R
WARNING
TISSUES CLEAR
The decompression
tissue inert gas loading
has been set to default
levels�
Plan repetitive dives
accordingly.
.0
0
ft
MAX
ft
103.6 4:57
STOPWATCH
SURFACE
Deep
19:16
FD
C
L
E
A
R
WARNING
VERY HIGH CNS
Central Nervous
System (CNS) toxicity
clock exceeded 150%
Switch to a gas with a
lower PPO2 or ascend
shallower (decompres-
sion ceiling allowing)
.0
0
ft
MAX
ft
103.6 4:57
STOPWATCH
SURFACE
Deep
19:16
FD
C
L
E
A
R
WARNING
HIGH CNS
Central Nervous
System (CNS) toxicity
clock exceeded 90%
Switch to a gas with a
lower PPO2 or ascend
shallower (decompres-
sion ceiling allowing)
+
Contact Shearwater
The subsequent list of warnings, errors and
notifications is not exhaustive� Please contact
Shearwater if you experience any unexpected errors:
info@shearwater�com