Dometic MCS15 - Manual (Page 28)

EN
Troubleshooting MCS5, MCS15
28
Fan runs continu-
ously although it is set
to cycle with compres-
sor. Failed triac on control panel
circuit board. Send for repair or call local
service technician.
No cooling or heating. The Marine Climate System is
programmed for heat or cool only.
Reprogram parameter P-1.
“HPF” or “LPF” is displayed. See below.
No heat. The Marine Climate System may
be set to Electric Heat, not
Reverse Cycle. Reprogram parameter P-15.
Unit switches to heat
while in Cool Mode. De-icing feature enabled due to
coil icing up. Reprogram parameter P-8
Fan coil is iced. Improper airflow. 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.
System runs
continuously. Improper air sensor location. Verify display head location.
Install alternate air sensor if
necessary.
Unrealistic set point. Adjust set point until unit cycles
off.
“ASF” (Air Sensor
Failure) is displayed. Indicates failed face plate air
sensor, alternate air sensor or
display cable. Unplug alternate air sensor if
installed or plug in alternate air
sensor if not installed.
Try another display cable.
Damaged jack/socket in display
head or on circuit board. Visually check to see that pins
inside socket are not bent or
corroded.
Repair or replace display or
circuit board if needed.
“FIL” (Filter Replace-
ment) is flashing. Filter needs replacement. Replace filter.
Reset P-21 to “00”.
Problem Possible Reason Solution