TROUBLESHOOTING
Smart Touch Cabin Control Installation & Operations Manual
30
L-3380 ENGLISH
D
IGITAL
C
ONTROLS
T
ROUBLESHOOTING
See also “General Troubleshooting” on page 27.
PROBLEM
POSSIBLE REASONS
SOLUTIONS
Digital display panel is not
shown.
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 set for either fan cycling with
compressor or continuous fan operation.
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.
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.
2. “High Pressure Fault” or “Low Pressure
Fault” is displayed.
3. (For CW systems only) Chilled-water loop is
inadequately cooled or heated, chiller
system is not in the proper mode of
operation, or Electric Heater is disabled.
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 15. If the
air handler system is equipped with an
electric heater, ensure that Option 7,
Electric Heat Option
, is enabled.
No heat
Digital Control may be set to Electric Heat, not
Reverse Cycle.
Reprogram Reverses Fan Speed in Heat under
General Settings
Unit switches to heat while
in Cool Mode.
De-icing feature enabled due to coil icing up.
Reprogram De-Ice Cycle under the DX settings.
Fan coil is iced.
Improper airflow.
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.
System runs continuously.
Improper air sensor location.
Verify display head location with criteria found in
the control manual. Install alternate air sensor if
necessary.
