Specifications

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English
L-2254 Troubleshooting
TROUBLESHOOTING
General Troubleshooting
Fault: Will not start.
Possible Reason/Correction
1. A/C circuit breaker is off.
2. Control is not turned on.
3. Wrong wiring at terminal strip.
4. Push-on butt connectors became
disconnected during installation.
5. Input line voltage is insufficient.
Fault: Fan is not running.
Check specic control troubleshooting section
Fault: No cooling or heating.
Possible Reason/Correction
1. Temperature set point is satised.
2. Obstructed seawater ow.
3. Seawater pump may be air-locked.
Loss refrigerant gas.
5. Seawater temperature too high for cooling or too
low for heating.
Fan coil is iced (in cooling).
7. Fan is not running.
8. Seawater plumbing is air-locked.
9. Digital control is programmed for Cool or Heat
only, or mechanical control thermostat is rotated
to far towards either Cooler or Warmer setting.
10. High pressure switch open (in cooling) due to
improper seawater ow.
11. High pressure switch open (in heating) due to
improper airow.
12. High-pressure switch is open in heating mode.
13. Compressor’s thermal overload is open due to
either of the above reasons.
Fault: No heating.
Possible Reason/Correction
1. Unit is “cool only”, or if reverse cycle, reversing
valve may be stuck.
Fault: Low airow.
Possible Reason/Correction
1. Airow is blocked.
2. Fan Coil is iced.
Fault: Fan coil is iced.
Possible Reason/Correction
1. Thermostat set point is too low.
2. Improper airow.
3. Supply air is short-cycling.
4. Humidity level too high.
5. When all else fails.
Fault: Water coil is iced in the heating
mode.
Seawater temperature is below 40°F.
Fault: System runs continuously.
Possible Reason/Correction
1. Set point temperature is improperly set: too low
for cooling or too high for heating.
2. Porthole or hatches open.
3. Seawater temperature too high for cooling or to
low for heating.
4. Improper air sensor location.
Digital Controls Troubleshooting
Fault: Digital display panel is not lit.
Possible Reason/Correction
1. 8-pin display cable plugs are not making contact
(unplugged, dirty, bent, or broken pins).
Fault: Fan is not running or runs
continuously.
Possible Reason/Correction
1. Digital control is programmed for either fan cy-
cling with compressor or continuous fan opera-
tion.