Dometic MCS6 Notice D'utilisation page 24

Troubleshooting
Problem
No cooling or heating
(contn'd).
No cooling
No heating.
24
Possible Reason
Fan coil is iced (in cooling).
Fan is not running.
Seawater plumbing is air-locked.
The Marine Climate System is
programmed for Cool or Heat
only, or mechanical control ther-
mostat is rotated too far towards
either Cooler or Warmer setting.
High pressure switch open (in
cooling) due to improper sea-
water flow.
Strainer or intake may be
plugged, seacock may be closed.
High pressure switch open (in
heating) due to improper airflow.
High-pressure switch is open in
heating mode.
Compressor's thermal overload is
open due to either of the above
reasons.
Control panel may not be in "cool"
position.
Coil iced.
Unit is "cool only", or if reverse
cycle, reversing valve may be
stuck.
MCS6, MCS12, MCS16
Solution
See below.
See corresponding section in
"Control Panel Troubleshooting"
on page 27.
Ensure that seawater plumbing is
installed per the guidelines in the
Installation Manual.
Set P1 to the desired value or
rotate the mechanical control
thermostat.
Check seawater hose for kinks or
collapses.
Verify pump operation.
Check pump circuit breaker if
applicable.
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
possible).
System may cycle on high-pres-
sure if seawater temperature is
above 55 °F (12.8 °C).
Compressor needs to cool down.
Turn system off for a while (it may
take up to three hours to reset
thermal overload).
Reset control panel.
See below.
Tap reversing valve lightly with
rubber mallet while unit is in heat
mode.
Call for service if that does not
correct the problem.
EN