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Dometic Elite Control DX systems Manual

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Digital-Controls Troubleshooting Elite Control Operations Manual
16 L-2230 ENGLISH
No cooling or heating. 1. Digital control programmed for heat or cool only. Press Mode button to achieve
desired mode.
2. "HPF" or "LPF" is displayed. See below.
No heat. Digital Control may be set to Electric Heat, not Reverse Cycle. Reprogram parameter
P-13.
Unit switches to heat while in
Cool Mode.
De-icing feature enabled due to coil icing up.
Reprogram parameter P-7.
Fan coil is iced. Improper airflow. See the General Troubleshooting section above first, before
reprogramming digital control.
Reprogram parameter P-7 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-2 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.
"ASF" is displayed.
(Air Sensor Failure)
1. Indicates failed face plate air sensor, alternate air sensor or display cable.
Unplug alternate air sensor if installed or plug in alternate air sensor if not installed.
Try another display cable.
2. Damaged jack/socket in display head or on circuit board. Visually check to see
that pins inside socket are not bent or corroded. Repair or replace display or circuit
board if needed.
"FIL" is flashing
(Filter Reminder)
Filter needs cleaning or replacement.
Clean or replace filter, and reset P-19 to "00”.
"HPF" is displayed.
(High Refrigerant Pressure)
1. High-pressure switch is open (in cooling) due to improper seawater flow.
Strainer or intake may be plugged, seacock may be closed. Check seawater hose for
kinks or collapses. Verify pump operation; check pump circuit breaker if applicable.
2. High-pressure switch open (in heating) due to improper airflow. Remove
obstructions in return air stream. Clean air filter and grille. Check for crushed or
restricted ducting. Ducting must be as straight, smooth and taut as possible.
If problem persists, reprogram Low Fan Speed Limit for maximum value. Set P-2 to
64, and set the reverse fan speeds during Heating Mode parameter P-12 to “rEF", or
manually set fan speed to high.
"LAC" is displayed.
(Low AC Voltage)
1. Supply voltage is too low. Verify power to unit with multimeter.
2. Voltage is improperly calibrated. Verify that P-22 matches voltage reading to unit
with a multimeter. Adjust P-22 if necessary.
"LPF" is displayed.
(Low Refrigerant Pressure)
1. Low-pressure switch is open due to low seawater and/or low return air
temperatures. Try restarting the air conditioning unit, the optional low pressure
switch has a ten minute shutdown time delay that may be in effect.
2. Low pressure switch is open due to loss of refrigerant. Check air conditioning unit
for refrigerant oil leakage, call service technician.
"PLF" is displayed.
(Low Pump Flow)
1. Condenser coil is too hot. Verify that unit is getting water flow, and that condenser is
not fouled.
2. Thermistor is damaged. Unplug water sensor if installed. Try another if it is
available.
3. Damaged jack/socket on circuit board. Visually check to see that pins inside
socket are not bent or corroded. Repair or replace circuit board if needed.
Table 4: Digital-Controls Troubleshooting (continued)
PROBLEM POSSIBLE REASON/SOLUTION
… 18 …


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