Dometic MCS5 Notice D'utilisation page 30

_BA_MCS.book Seite 30 Donnerstag, 2. April 2009 9:56 09
Troubleshooting
Problem
System runs
continuously.
"ASF" (Air Sensor
Failure) is displayed.
"FIL" (Filter Replace-
ment) is flashing.
"HPF" (High Freon
Pressure) is
displayed.
"LAC" (Low AC
Voltage) is displayed.
30
Possible Reason
Improper air sensor location.
Unrealistic set point.
Indicates failed face plate air
sensor, alternate air sensor or
display cable.
Damaged jack/socket in display
head or on circuit board.
Filter needs replacement.
High-pressure switch is open (in
cooling) due to improper sea-
water flow.
Strainer or intake may be
plugged, seacock may be closed.
High-pressure switch open (in
heating) due to improper airflow.
Supply voltage is too low.
Voltage is improperly calibrated.
MCS5, MCS15
Solution
Verify display head location.
Install alternate air sensor if
necessary.
Adjust set point until unit cycles
off.
Unplug alternate air sensor if
installed or plug in alternate air
sensor if not installed.
Try another display cable.
Visually check to see that pins
inside socket are not bent or
corroded.
Repair or replace display or
circuit board if needed.
Replace filter.
Reset P-21 to "00".
Check seawater hose for kinks or
collapses.
Verify pump operation.
Check pump circuit breaker if
applicable.
Remove obstructions in return air
stream.
Clean air filter and grille.
Check for crushed or restricted
ducting (ducting must be as
straight, smooth and taut as
possible).
If problem persists,
– reprogram Low Fan Speed
Limit for maximum value: Set
P-3 to "64"
– set the reverse fan speeds dur-
ing Heating Mode parameter
P-13 to "rEF", or manually set
fan speed to high
Verify power to unit with multi-
meter.
Verify that P-22 matches voltage
reading to unit with a multimeter.