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Troubleshooting
• SYMPTOM: The air conditioning does not attempt to turn on.
CAUSE: The compressor timer lockout may prevent the air conditioner
from turning on for a period of time.
REMEDY: Consult the Owner’s Manual in the Installer Setup section to
defeat the Cycles Per Hour (page 26).
• SYMPTOM: The display is blank.
CAUSE: Lack of proper power.
REMEDY: Make sure the power is on to the furnace and that you have
24vac between R & C.
• SYMPTOM: The air conditioning does not attempt to turn on.
CAUSE: The cooling setpoint is set too high.
REMEDY: Lower the cooling setpoint or lower the cooling set-point limit.
See Setpoint Limits (page 26).
• SYMPTOM: The heating does not attempt to turn on.
CAUSE: The heating setpoint is set too low.
REMEDY: Raise the heating setpoint or raise the heating set-point limit.
See Setpoint Limits (page 26).
• SYMPTOM: When controlling a residential heat pump, and asking for
cooling, the heat comes on.
CAUSE: The thermostat reversing valve jumper is set for B.
REMEDY: Set the reversing valve jumper for O.
• SYMPTOM: When calling for cooling, both the heat and cool come on.
CAUSE: The thermostat equipment jumper is configured for HP and the
HVAC unit is a Gas/Electric.
REMEDY: Set the equipment jumper for Gas.
• SYMPTOM: When the Program button is pressed, the display
reads “DISABLED”.
CAUSE: Program mode is set to NON PROGRAM.
REMEDY: Set Program Mode (Setup 1) to 1, 5/2, or 7 Day.
See Selecting Your Program Mode (page 25).
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