Dometic MCS5 Notice D'utilisation page 26

_BA_MCS.book Seite 26 Donnerstag, 2. April 2009 9:56 09
Troubleshooting
Problem
No heating.
Low airflow.
Fan coil is iced.
Water coil is iced in
the Heating Mode.
26
Possible Reason
Unit is "cool only", or if reverse
cycle, reversing valve may be
stuck.
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).
MCS5, MCS15
Solution
Tap reversing valve lightly with
rubber mallet while unit is in heat
mode.
Call for service if that does not
correct the problem.
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 chapter "Control Panel
Troubleshooting" on page 29 for
reprogramming 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.