Dometic MCS15 - Manual (Page 23)

EN
MCS5, MCS15 Troubleshooting
23
9 Troubleshooting
9.1 General Troubleshooting
Problem Possible Reason Solution
System will not start. Air conditioning unit circuit
breaker is off. Turn circuit breaker on at ship’s
panel.
Control is not turned on. Turn control on.
Wrong wiring at terminal strip. Check wiring diagram and correct
if necessary.
Push-on butt connectors became
disconnected during installation. Disconnect power supply and
open electric box.
Check wiring diagram, correct if
necessary.
Input line voltage is insufficient. Check power source (shore/gen-
erator) for proper voltage.
Check wiring and terminals for
proper sizes and connections.
Verify with a volt-meter that the
power at the unit is the same as
the power source.
Fan is not running. – See corresponding section in
“Control Panel Troubleshooting”
on page 27.
No cooling or heating. Temperature set point is satisfied. Lower or raise set point.
Obstructed seawater flow. Clean seawater strainer.
Check for obstructions at speed
scoop thru-hull inlet.
Check for a good steady flow
from the overboard discharge.
Seawater pump may be air-
locked. Remove hose from pump dis-
charge to purge air from line.
Loss refrigerant gas. Check air conditioning unit for
refrigerant oil leakage.
Call service technician.
Seawater temperature too high
for cooling or too low for heating. Seawater temperature will
directly affect air conditioning
unit’s efficiency.
This air conditioning unit can
effectively cool your boat in water
temperature up to 90 °F (32.2 °C)
and heat in water temperatures
as low as 40 °F (4.4 °C).