MAS Vector Compact 10K, Installation, Operation & Maintenance Manual, Page: 31 / 37

8/8/2014 VECTOR COMPACT
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FAULT POSSIBLE REASON CORRECTION
Will not start. A/C circuit breaker is off. Turn circuit breaker on at ship’s panel.
Control is not turned on. See control operation section in this manual.
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/generator) for proper
voltage. Check wiring and terminals for proper sizes
and connections.
Fan is not
running.
Check your specific control
troubleshooting section.
No cooling or
heating.
Temperature set point is above (in
cooling) or below (in heating)
ambient temperature.
Lower or raise set point
Obstructed sea water flow.
Clean sea water strainer. Check for obstructions at
speed scoop thru-hull inlet. Check for a good steady
flow from the overboard discharge.
Sea water pump may be air-
locked.
Remove hose from pump discharge to purge air from
line.
Loss of refrigerant gas.
Check a/c unit for refrigerant oil leakage, call service
technician (see back of manual).
Sea water temperature too high for
cooling or too low for heating.
Sea water temperature will directly affect the a/c
unit’s efficiency. This a/c unit can effectively cool
your boat in water temperatures up to 908 F and
heat (if reverse cycle option is installed) in water as
low as 408 F. Switch to electric heat if installed.
Coil is iced (in cooling). See below.
Fan is not running. See below.
Pressure switch opened. Check your specific control troubleshooting section.
No heating.
Unit is "cool only" not reverse
cycle.
Install optional electric heat; contact your dealer for
details.
GENERAL TROUBLESHOOTING GUIDELINES CONTINUED
FAULT POSSIBLE REASON CORRECTION
No air flow. Air flow is blocked.
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.