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TROUBLESHOOTING
D
C
IGITAL
ONTROLS
See also "General Troubleshooting" on page 32.
PROBLEM
Digital display
The 8-pin display-cable plugs are not
panel is not
making contact (unplugged, dirty, bent,
shown.
or broken pins).
Fan is not running
Digital control is set for either fan
or runs
cycling with compressor or continuous
continuously.
fan operation.
Fan is not running
Failed triac on circuit board.
but the
compressor is.
Fan runs
Failed triac on circuit board.
continuously
although it is set
to cycle with
compressor.
No cooling or
1. Digital control programmed for heat
heating
2. "High Pressure Fault" or "Low
3. (For CW systems only) Chilled-
No heat
Digital Control may be set to Electric
Heat, not Reverse Cycle.
Unit switches to
De-icing feature enabled due to coil
heat while in Cool
icing up.
Mode.
Fan coil is iced.
Improper airflow.
System runs
Improper air sensor location.
continuously.
"ASF" (Air Sensor
1. Indicates failed face plate air
Failure) is
displayed.
2. Damaged jack/socket in display
34
T
ROUBLESHOOTING
POSSIBLE REASONS
or cool only.
Pressure Fault" is displayed.
water loop is inadequately cooled
or heated, chiller system is not in
the proper mode of operation, or
Electric Heater is disabled.
sensor, alternate air sensor or
display cable.
head or on circuit board.
Smart Touch Cabin Control Installation & Operations Manual
SOLUTIONS
With POWER OFF at the circuit breaker, remove connector and
inspect. If damaged, replace connector or entire display cable.
Under Control Parameters, General Settings, change the fan
operation to cycled or continuous. 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.
Send for repair or call local service technician.
Send for repair or call local service technician.
1. Press Mode icon to achieve desired mode.
2. See below.
3. 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) or cooler (for cool mode), the water valve will not open.
See "CW Operational Settings" on page 17. If the air handler
system is equipped with an electric heater, ensure that Option
7, Electric Heat or Auxiliary Heat option, is enabled.
Reprogram Reverses Fan Speed in Heat under General Settings
Reprogram De-Ice Cycle under the DX settings.
See the General Troubleshooting section first, before
reprogramming digital control.
Reprogram De-Ice Cycle under the DX settings 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 to 75 for
maximum value.
Verify display head location with criteria found in the control
manual. Install alternate air sensor if necessary.
1. Unplug alternate air sensor if installed or plug in alternate air
sensor if not installed. Try another display cable.
2. Visually check to see that pins inside socket are not bent or
corroded. Repair or replace display or circuit board if needed.
L-3380 ENGLISH
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