Airstream INTERNATIONAL TRAILER Owner's Manual page 116

AIRSTREAM INTERNATIONAL TRAILER OWNERS MANUAL
4. When the button is released, the display will start cycling through the sender diagnostics. The
appropriate LED will light up indicating which sender is being shown. The five diagnostic values are as
follows:
a. The first diagnostic shown should be "n64" which indicates the number of bits that are being
received from the sender each time it transmits. The sender should always send 64 bits, if not then the
display will show "Err" during the scan cycle. The causes of the wrong number of bits could be bad
wiring, electrical interference, or a defective sender.
b. The second diagnostic is the maximum signal level. The three horizontal lines on the left digit
indicate this parameter. The tank must be at least 20% full for this number to be valid. The sender must
have at least 5% signal level to function; the maximum possible signal level is 99%. Normal maximum
signal levels should be in the 15% to 50% range. If the signal level is low, check for buildup inside the
tank, the sender peeling off the side of the tank, or low voltage (less than 10 V) to the display. If the signal
level is over 90%, incorrect readings may occur. Check for water or mud buildup right on the sender.
c. The third diagnostic is the minimum signal level. The single horizontal line on the left digit
indicates this parameter. The tank must be no more than 80% full for this number to be valid.
Normal minimum signal levels should be in the 0% to 2% range. If the signal level is high, incorrect
readings may occur. Check for water or mud buildup right on the sender.
d. The fourth diagnostic is the raw digital water/sewage level, for example "L45". The L indicates level,
and is the number of 1/8" increments that are covered by the water-sewage. So in our example "L45"
would indicate 5-5/8" of water.
e. The fifth diagnostic is the tank height, for example "HI5". The H indicates height, and is the number
of 1/2" increments that the sender length is, which is the number of receiver segments present on the
sender. So in our example "HI5" would indicate a 7 ½" sender with 15 receiver segments. You can verify
the percent level by dividing the level by the height and multiplying by 100. In our example it would be
5.625 (5-5/8" of water) divided by 7.5 times 100, which is 75%. The display will round off to the nearest 1
%.
5. When the fresh water diagnostics are done, the display will continuously show the LPG level. Refer to
the previous section for more details on this. Press the button to turn the display off, or let it shut down
automatically after 2 ½ minutes.
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