Q3 & Qht Controls for Direct Expansion Systems General System Troubleshooting
L-2516 ENGLISH 19
Fan coil is iced. 1. Thermostat set point is too low. Raise set point.
2. Improper airflow. Remove any obstructions in return air stream. Clean return air filter
and grille. Check for crushed or restricted ducting, must be as straight, smooth and
taut as possible. See “Digital-Controls Troubleshooting” on page 20 for
reprogramming options.
3. Supply air is short-cycling. Redirect supply air so that is not blowing into the return
air stream. Seal any air leaks on duct.
4. Humidity level too high. Close hatches and doors.
5. When all else fails. Switch air conditioning unit to heat until ice melts or use hair
dryer to melt.
Water coil is iced in the
Heating Mode.
Seawater temperature is below 40°F (4.4°C).
Shut down system to prevent damage to
condenser. Allow coil to defrost.
Table 6: General System Troubleshooting (continued)
PROBLEM POSSIBLE REASON/SOLUTION
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