Troubleshooting; General Troubleshooting - Dometic AH-Passport I/O Compact Operation Manual

General Troubleshooting

TROUBLESHOOTING

G T
ENERAL ROUBLESHOOTING
See additional troubleshooting information in the manual for your specific chiller system.
Table 3: General Troubleshooting
PROBLEM
System will not start.
Fan is not running.
No cooling or heating.
Low airflow.
System runs continuously.
12
POSSIBLE REASON/SOLUTION
1. Air handler circuit breaker is off. Turn circuit breaker on at ship's panel.
2. Digital control is not turned on. Press the Power button.
3. Wrong wiring at terminal strip. Check wiring diagram; correct if necessary.
4. Input-line voltage is insufficient. Check power source (shore/generator) for proper
voltage. Check wiring and terminals for proper sizes and connections. Verify with a
volt-meter that the power at the unit is the same as the power source.
5. Push-on connectors or butt splices became disconnected during installation.
Disconnect power supply and open electric box, check wiring diagram, correct if
necessary.
Check "Digital-Controls Troubleshooting" on page 13.
1. Temperature set point is satisfied. Lower or raise set point.
2. Fan is not running. Check your specific control troubleshooting section.
3. Digital control is programmed for Cool or Heat only, or mechanical-control
thermostat is rotated too far toward either Cooler or Warmer setting. See the
control's Operations Manual for instructions.
4. Chilled-water loop is inadequately cooled or heated, chiller system is not in the
proper mode of operation, or Electric Heater is disabled. If the air handler system
is equipped with water-temperature sensors, check the water temperature at the
digital control by pressing the Up and Power buttons simultaneously while in On
mode. If the water temperature is not at least 15°F warmer (for heat mode) or cooler
(for cool mode), the water valve will not open. See "Temperature Differential of Air &
Water" on page 11 and the P-19 programmable parameter for more information. If the
air handler system is equipped with an electric heater, ensure that programmable
parameter P-15 is set to "ELE".
1. Airflow is blocked. Remove any obstructions in return-air stream. Clean return-air
filter and grille. Check for crushed or restricted ducting; ducting must be as straight,
smooth and taut as possible.
2. Fan speed is set to manual low. If the fan speed is set to manual low, press and
release the Fan button until the desired fan speed and airflow are reached. If you
want automatic fan speed control, press and release the Fan button until the letter "A"
displays.
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. Improper air sensor location. Check your specific control troubleshooting section.
AH-Passport I/O Control Operations Manual
L-2232 ENGLISH