CTM Marine Self-Contained CT Installation & User Manual
20
PROBLEM
POSSIBLE CAUSE
POSSIBLE SOLUTION
Unit is not heating
Temperature set point.
Lower temperature to desired temperature on
display control.
Wrong wiring terminal strip
Check the wiring diagram and make the
necessary corrections
Obstructed seawater flow
Clean seawater strainer, check for any
obstructions at scoop thru-hull inlet, and check
for good steady flow from overboard discharge.
Seawater pump may be air- Remove hose from pump discharge to purge air
locked
from line.
Loss of refrigerant gas
Check unit for leakage and call an certified
technician.
Seawater temperature to
low for heating.
Seawater temperature will directly affect the
efficiency of your unit. Your unit will effectively
heat your boat with seawater temperatures as
low as 40ºF (4.4ºC).
High-Pressure Switch is
open due to improper
seawater flow
Strainer or intake may be plugged, seacock may
be closed. Check seawater hose for kinks or
collapses. Verify pump operation.
High-Pressure Switch is
open due to high seawater
temperature
The unit may cycle on high pressure if seawater
temperature is above 55ºF (12.8ºC), increase fan
speed.
Unit is in “cool only” mode,
or reversing valve may be
stuck.
Tap reversing valve lightly with a rubber mallet
while is in heat mode. Call a certified technician if
this doesn’t work.
Low Airflow
Airflow is blocked
Remove obstructions from the return air stream.
Clean return-air filter and grille. Check crushed or
obstructed ducting.
Fan speed set to manual
low
Set fan speed to desired speed.
Fan coil is iced
Thermostat set too low.
Raise temperature
Improper flow
Remove obstructions from the return air stream.
Clean return-air filter and grille. Check crushed or
obstructed ducting.
