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Passport I/O Digital Controls Troubleshooting
9 Troubleshooting
The following table describes some common
occurrences that are not a result of defective
workmanship or materials.
Problem
Possible Causes
Recommended Solution
The system does
not power up.
The air conditioning unit’s circuit breaker
is off.
Turn on the air conditioning unit’s circuit breaker at the ship’s
panel.
The display is not turned on.
Turn on the display.
The terminal strip is miswired.
Check the wiring diagram and correct if necessary.
The input-line voltage is insufficient.
• Check the power source (shore/generator) for proper voltage.
• Check the wiring and terminals for proper sizes and
connections.
• Verify with a voltmeter that the power at the unit is the same as
the power source.
An electrical component has failed.
A technician should inspect the display, cable, and circuit board.
Look for a red light on the circuit board.
The system runs
continuously.
The unit is not able to reach the set point.
Close all the port holes and hatches. Adjust the set point so it is
not too low for cooling or too high for heating.
The seawater temperature is too high for
cooling or too low for heating.
Seawater temperature will directly affect the air conditioning unit’s
efficiency. This air conditioning unit can effectively cool your boat
in water temperatures up to 90 °F (32 °C) and heat (if reverse-cycle
option is installed) in water as low as 40 °F (4 °C).
The alternate air temperature sensor is not
located properly.
• Verify the display location with the criteria found in the
installation section of this manual.
• Install an alternate air temperature sensor if necessary. If an
alternate air temperature sensor is already installed in the
air stream, ensure it does not touch anything warm (like the
condenser coil).
The de-icing feature is not enabled.
Enable de-icing in the parameters. If ice still forms immediately,
revisit the above possible causes.
I
Ice on a fan coil can be removed quickly by running the unit in
heat mode.
There is a lack of
airflow.
The airflow is blocked or restricted.
• Remove any obstructions in the return-air stream.
• Clean the return-air filter and grille.
• Check for crushed or restricted ducting. Ducting must be as
straight, smooth, and taut as possible.
The fan speed is set to manual low.
• If the fan speed is set to manual low, raise the speed to a higher
setting or set to AUTOMATIC mode.
• Or, increase the minimum low speed in the program
parameters.
The fan coil may be iced.
See “The fan coil is iced” in this table.
The condenser
coil is iced while
in heat mode.
The seawater temperature is below
40 °F (4 °C).
• Shut down the system to prevent damage to the condenser.
• Allow the coil to defrost.
The fan coil is
iced.
The humidity level is set too high.
Close the hatches and doors.
The supply air is short-cycling.
• Redirect the supply air so that is not blowing in or near the
return-air stream.
• Seal any air leaks on the duct.
