Dometic MCS6 Notice D'utilisation page 28

Troubleshooting
Problem
Fan runs continu-
ously although it is set
to cycle with compres-
sor.
No cooling or heating. The Marine Climate System is
No heat.
Unit switches to heat
while in Cool Mode.
Fan coil is iced.
System runs
continuously.
"ASF" (Air Sensor
Failure) is displayed.
"FIL" (Filter Replace-
ment) is flashing.
28
Possible Reason
Failed triac on control panel
circuit board.
programmed for heat or cool only.
"HPF" or "LPF" is displayed.
The Marine Climate System may
be set to Electric Heat, not
Reverse Cycle.
De-icing feature enabled due to
coil icing up.
Improper airflow.
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.
MCS6, MCS12, MCS16
Solution
Send for repair or call local
service technician.
Reprogram parameter P-1.
See below.
Reprogram parameter P-15.
Reprogram parameter P-8
See corresponding section in
"General Troubleshooting" on
page 23, before reprogramming
the Marine Climate System.
Reprogram parameter P-8 to
enable de-icing.
If de-icing cycle does not melt ice,
switch air conditioning unit to
heat until ice melts or use hair
dryer to melt ice.
If problem persists, reprogram
Low Fan Speed Limit for maxi-
mum value: Set P-3 to 64.
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".
EN