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TROUBLESHOOTING GUIDE
Error Codes
If a sender or its wiring is not operating properly, the following codes are
shown on the display:
DISPLAY CODE
POSSIBLE CAUSE
Open circuit
1. If a sender is unresponsive.
O P n
2. There is an open circuit in the
wiring so the sender is not
LEVEL IN PERCENT
connected.
Short circuit
Blue communication wire from
s h t
senders to display is shorted to
ground.
LEVEL IN PERCENT
Indicates signal corruption
Error
between the sender and display
E r r
due to bad wiring, bad senders,
or multiple senders programmed
LEVEL IN PERCENT
the same.
The display has been
programmed for a single sender
Stacked senders
where double-stacked senders
S t A
have been connected. The display
has not been set to look for two
LEVEL IN PERCENT
senders
The display has been
No top sender
programmed for double-stacked
n t P
senders and one of these error
codes are showing:
LEVEL IN PERCENT
• ntP - only the bottom sender is
No bottom sender
reporting
n b o
• nbo - only the top sender is
LEVEL IN PERCENT
reporting
The memory used to store
Calibration failure
programming for battery voltage
C A L
calibration value and tank sender
signal values has failed.
LEVEL IN PERCENT
The only LPG diagnostic code is
For LPG only
the open circuit. If the wiring to
O P n
the LPG sender is shorted then the
LPG will always show "0".
LEVEL IN PERCENT
W
NOTE: There are no diagnostics for battery voltage.
SeeLeveL II 709 Series Display Manual
SOLUTION
See Wiring Diagnostics
flowchart on page 14.
Check all the senders
to make sure they are
programmed correctly.
If they are, replace the
sender that is creating
the error.
Change the senders or
reprogram the display as
required.
Correct the programming
on the sender.
Replace the display.
Sender Diagnostics
These diagnostics can be used to check the senders:
Reviewing Sender Diagnostics
The sender diagnostics can be reviewed periodically to check for any
degradation of the tank senders. If a sender appears to be malfunctioning,
reviewing the diagnostics should be the first step in the troubleshooting
process. There are two diagnostics for the senders:
Sender signal power is an indication of how much signal is being
transmitted through the tank wall and picked up by the receive part of the
sender. Sender height is the number of receive segments present in the
sender.
SIGNAL POWER PROBLEM
POSSIBLE CAUSE
It can indicate a sender
which is detached from
the tank, excessive
buildup on the inside of
If the signal power is too low.
the tank, bad wiring to
the sender, low battery
voltage, or a defective
sender.
SENDER HEIGHT PROBLEM
The number of segments reporting is
less than the amount of segments on the
sender.
The senders always auto calibrate to the length that they are cut, so this diagnostic
allows the user to confirm the length and to make sure that the auto calibration is
working properly.
RESULT
Typical signal power
should be 50% to
60%.
The minimum signal
power for proper
operation is 20%.
P00 is 100%
RESULT
One or more segments are not
reporting. Either cut sender to a
shorter length or replace the sender.
Page 12
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Table of Contents
Troubleshooting
