Dometic MCS6 Operating Manual page 25

MCS6, MCS12, MCS16
Problem
Low airflow.
Fan coil is iced.
Water coil is iced in
the Heating Mode.
System runs
continuously.
EN
Possible Reason
Airflow is blocked.
Fan Coil is iced.
Thermostat set point is too low.
Improper airflow.
Supply air is short-cycling.
Humidity level too high.
When all else fails.
Seawater temperature is below
40 °F (4.4 °C).
Set point temperature is improp-
erly set: too low for cooling or too
high for heating.
Porthole or hatches open.
Troubleshooting
Solution
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.
See below.
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.
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.
Redirect supply air so that is not
blowing into the return air stream.
Seal any air leaks on duct.
Close hatches and doors.
Switch air conditioning unit to
heat until ice melts or use hair
dryer to melt.
Shut down system to prevent
damage to condenser.
Allow coil to defrost.
Raise or lower set point.
Close all port holes and hatches.
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