SUUNTO DX - Manual (Page 50)

Figure Indication Display
C The flash symbol is blinking. Pressure reading exceeds allowed
limit (over 360 bar/5220 psi). - - -
D Text "no conn" is displayed when the unit receives no data packets
from the transmitter.
Pressure reading has not been updated for more than one minute.
The latest valid pressure reading is displayed intermittently. The
flash symbol is not displayed.
Transmitter is out of range (>1.2 m/4 ft), in power saving mode or
on another channel. Activate the transmitter by breathing off the
regulator, and bring the D-series unit closer to the transmitter then
check if the flash symbol appears. If not, clear the code on the
Suunto D-series unit. no conn
E Pressure transmitter battery voltage is low. The pressure reading
is displayed intermittently. Change the transmitter battery! batt
A B C D E
51