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SPECIAL FEATURES
E.
Power Interruption
In the event power to the air conditioner or control is interrupted, the system will restart with the
previous set-points once power is restored.
F.
LCD Error Code
When the system determines one of the faults listed has occurred, an error code displays on the
LCD.
Error Code:
E1
Loss of communication between CT thermostat and module board. LCD will cycle be-
tween E1 and previous mode setting. System will shut down.
E2
Open circuit or out of range Indoor Temperature Sensor. Heating and cooling operation
will be locked out. Fan operation can continue to operate.
E3
Shorted Indoor Temperature Sensor. Heating and cooling operation will be locked out.
Fan operation can continue to operate.
E4
Open circuit or out of range Outdoor Temperature Sensor (select models). Heat Pump
operation will be locked out. Air Conditioner, Fan, and Furnace operation can continue to
operate.
E5
Open Circuit or out of range Freeze Sensor. Air Conditioner mode of operation will be
locked out, but displays the last temperature set-point.
GENERAL INFORMATION
A.
Frost Formation
1. On Cooling Coil
a. Frost on a small portion of the coil is not unusual. Under certain conditions, ice may form
on the evaporator coil. This is indicated by very cold output at very low air speed and the
icing can be seen through the air inlet hole with the filter removed. If this should occur,
inspect the filter and clean if dirty. Make sure air vents are open and not obstructed.
Units have a greater tendency to frost when the outside temperature is relatively low.
This may be prevented by adjusting the thermostat control knob to a warmer setting
(counter clockwise). Should frosting continue, operate on any FAN ONLY setting until
the cooling coil is free of frost; then resume normal operation. If frost condition persist,
contact your local service center for assistance.
2. On Outdoor Coil While Heating
a. Operation at low outdoor temperatures causes low coil temperatures. This can result in
ice forming on the outdoor coil in certain conditions. This is indicated by reduced heat
output and could fully stop fan rotation in extreme conditions. To avoid this, the system
controls turn off the compressor if outdoor temperature drops below 42° F (5° C) and
returns heating when the temperature raises 5° F (-15° C).
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