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Troubleshooting Passport I/O Digital Controls
Problem Possible Causes Recommended Solution
The fan coil is
iced. (continued)
The airflow is blocked or restricted
See “There is a lack of airflow” in this table.
The fan runs too slow.
Set the fan speed to AUTOMATIC mode or increase the manual
fan speed. Or, increase the minimum low speed in the program
parameters.
The system runs continuously.
Close hatches and doors, raise set point, turn on de-icing.
The fan does
not run or runs
continuously.
The digital control is set for either fan
cycling with compressor or for continuous
fan operation.
Change the fan operation to continuous fan operation or fan
cycling with compressor.
I
When configured for electric heat, the fan will stay on for four
minutes aer a heat cycle ends even if the fan is set to cycled
operation.
The circuit board on the unit is defective.
Typically, the compressor and pump are
still running.
Call for service to replace the board.
I
A shorted relay or triac may cause the fan to never shut off or
never turn on. If the fan never shuts off, the fan may be set to
‘continuous’ on the display.
The unit does not
heat.
The unit does not have a heating cycle.
Most units have a reverse cycle to create heat, but some units may
not have this function.
The display is set to cool-only or electric
heat.
Change the parameters on the display or press the Mode button
to set HEAT or AUTOMATIC. The electric heat will not function
if the display is set to electric heat and the unit does not have an
electric heater added.
The reversing valve is stuck.
• Lightly tap on the valve with a rubber mallet while the unit is in
HEAT mode.
• Call a service technician if that does not correct the problem.
The seawater temperature is too low.
Seawater temperature directly affects the unit’s efficiency. For
the unit to heat (if the reverse-cycle option is available), water
temperatures must be 40°F (4°C) or higher.
There is a loss of refrigerant gas.
• Check the air conditioning unit for a refrigerant oil leak.
• Call for service.
(For CW systems only)
The chilled-water loop is inadequately
heated, the chiller system is not in the
proper mode of operation, or the electric
heater is disabled.
• Be sure the chiller is in HEAT mode.
• If the air handler system is equipped with water-temperature
sensors, check the water temperature at the digital control.
• If the water temperature is not at least 15°F warmer for HEAT
mode, the water valve will not open.
• If the air handler system is equipped with an electric heater,
ensure that the electric heat is enabled.
The unit does not
cool.
The display is set to heat-only.
Change the parameters on the display or press the Mode button
to set COOL or AUTOMATIC mode.
The seawater temperature is too high.
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). The unit may still work
at higher water temperatures, but not as efficiently.
There is a loss of refrigerant gas.
• Check the air conditioning unit for a refrigerant oil leak.
• Call for service.
(For CW systems only)
The chilled-water loop is inadequately
cooled or the chiller system is not in the
proper mode of operation.
• Be sure the chiller is in COOL mode.
• If the air handler system is equipped with water-temperature
sensors, check the water temperature at the digital control.
• If the water temperature is not at least 15°F cooler for COOL
mode, the water valve will not open.
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