Digital-Controls Troubleshooting
Passport I/O Control Operations Manual
14
L-2231 ENGLISH
D
IGITAL
-C
ONTROLS
T
ROUBLESHOOTING
See also “General Troubleshooting” on page 12.
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.
System runs continuously.
1.
Set point temperature is improperly set: too low for cooling or too high for
heating.
Raise or lower set point.
2.
Porthole or hatches open.
Close all port holes and hatches.
3.
Seawater temperature 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
(32.2°C) and heat (if reverse cycle option is installed) in water as low as 40°F (4.4°C).
4.
Improper air sensor location.
Check your specific control troubleshooting section.
Table 4: Digital-Controls Troubleshooting
PROBLEM
POSSIBLE REASON/SOLUTION
Digital display panel is not
lit.
The 8-pin display-cable plugs are not making contact (unplugged, dirty, bent, or
broken pins).
With POWER OFF at the circuit breaker, remove connector and inspect. If
damaged, replace connector or entire display cable.
Fan is not running or runs
continuously.
Digital control is programmed for either fan cycling with compressor or continuous
fan operation.
Reprogram parameter P-14. Note: When configured for electric heat, after
a heat cycle ends the fan will stay on for 4 minutes even if the fan is set to cycled
operation.
Fan is not running but the
compressor is .
Failed triac on circuit board.
Send for repair or call local service technician.
Fan runs continuously
although it is set to cycle
with compressor.
Failed triac on circuit board.
Send for repair or call local service technician.
No cooling or heating.
1.
Digital control programmed for heat or cool only.
Reprogram parameter P-1.
2.
"HPF" or "LPF" is displayed.
See below.
No heat.
Digital Control may be set to Electric Heat, not Reverse Cycle.
Reprogram parameter
P-15.
Unit switches to heat while in
Cool Mode.
De-icing feature enabled due to coil icing up.
Reprogram parameter P-8
Fan coil is iced.
Improper airflow.
See the General Troubleshooting section above first, before
reprogramming digital control.
Reprogram parameter P-8 to enable de-icing. If de-icing cycle does not melt ice, switch
air conditioning unit to heat until ice melts or use hair dryer to melt ice.
If problem persists, reprogram Low Fan Speed Limit for maximum value. Set P-3 to 64.
System runs continuously.
Improper air sensor location.
Verify display head location with criteria found in the
control manual. Install alternate air sensor if necessary. Ensure the control display is
located out of direct sunlight and away from open doors or hatches. Or, if using an
alternate air sensor, ensure the sensor is located directly in the system’s return-air path to
obtain an accurate reading.
Table 3: General Troubleshooting (continued)
PROBLEM
POSSIBLE REASON/SOLUTION
Summary of Contents for Passport I/O
Page 23: ...NOTES...
