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EN
Passport I/O Digital Controls Troubleshooting
Problem
Possible Causes
Recommended Solution
The unit switches
to heat while in
COOL mode.
The de-icing feature is enabled due to
the coil possibly icing up during long run
times.
This is normal when the de-icing feature is enabled. Reprogram
the de-icing cycle under the parameter settings.
The pump does
not shut off.
The circuit board is shorted.
• Call service to verify if a relay on the circuit board is shorted or if
the pump relay board is defective, if applicable.
• Replace any board that is shorted.
The pump parameter on the display is set
for the pump to run continuously.
Change the parameter on the display so the pump cycles with the
compressor.
The pump does
not run.
A high-pressure fault may be present.
See “A high-pressure fault is present” in this table.
The compressor
does not shut off.
A relay on the circuit board has shorted
closed.
Call service to verify and replace the board.
The compressor
does not run.
A relay on the circuit board has shorted
open.
Call service to verify and replace the board.
There is an open overload on the
compressor.
• Call service to verify and repair.
• If the overload on the compressor is internal, wait several hours
for it to cool before testing.
A low-pressure
fault is present.
The unit does not have a low-pressure
switch, but the JP2 jumper on the circuit
board has been removed or a parameter,
if applicable, has been enabled on the
display.
• If the unit does not have a low-pressure switch, ensure the JP2
jumper on the board is in place over both pins.
• Disable the parameter, if applicable.
The low-pressure switch is open due
to low seawater and/or low return-air
temperatures.
Try to restart the air conditioning unit. The optional low-pressure
switch has a ten-minute shutdown time delay that may be in effect.
The low-pressure switch is open due to a
loss of refrigerant.
• Check the air conditioning unit for a refrigerant oil leak.
• Call for service.
The low-pressure switch is defective or a
wire is loose.
• Contact a servicing dealer to test the low-pressure switch and
to ensure the wires are properly connected and seated in the
orange plug on the circuit board.
• Ensure the orange plug is not installed backwards on the circuit
board.
A high-pressure
fault is present.
The seawater flow is obstructed. The
condenser coil may be too hot to touch.
• Water should be flowing strongly out of the overflow. Be sure
the seacock is open and water is flowing to the pump.
• Clean the seawater strainer.
• Check for obstructions at the speed scoop thru-hull inlet.
• Check if the unit water loop requires maintenance or cleaning.
The high-pressure switch is defective or a
wire is loose.
• Contact a servicing dealer to test the high-pressure switch and
to ensure the wires are properly connected and seated in the
orange plug on the circuit board.
• Ensure the orange plug is not installed backwards on the circuit
board.
The high-pressure switch is open
(in heating) due to a high seawater
temperature.
The system may cycle on high-pressure if the seawater temperature
is above 55 °F (13 °C).
I
In HEAT mode a high pressure fault will not appear on the
display.
