Dometic MCS15 - Manual (Page 25)

EN
MCS5, MCS15 Troubleshooting
25
Low airflow. Airflow is blocked. Remove any obstructions in
return air stream.
Clean return air filter and grille.
Check for crushed or restricted
ducting, ducting must be as
straight, smooth and taut as pos-
sible.
Fan Coil is iced. See below.
Fan coil is iced. Thermostat set point is too low. Check setting on control panel.
If setting is extreme for condi-
tions, raise set point until unit
cycles off to give coil time to
thaw.
Improper airflow. Remove any obstructions in
return air stream.
Clean return air filter and grille.
Check for crushed or restricted
ducting.
Ducting run must be as straight
as possible; remove any excess
ducting.
See the “Control Panel Trouble-
shooting” on page 27 for repro-
gramming options.
Supply air is short-cycling. Redirect supply air so that is not
blowing into the return air stream.
Seal any air leaks on duct.
Humidity level too high. Close hatches and doors.
When all else fails. Switch air conditioning unit to
heat until ice melts or use hair
dryer to melt.
Water coil is iced in
the Heating Mode. Seawater temperature is below
40 °F (4.4 °C). Shut down system to prevent
damage to condenser.
Allow coil to defrost.
System runs
continuously. Set point temperature is improp-
erly set: too low for cooling or too
high for heating. Raise or lower set point.
Porthole or hatches open. Close all port holes and hatches.
Problem Possible Reason Solution