Most settings are stored in non-volatile (permanent) memory. Only the clock and the day must be set if the thermostat was
without AC power or batteries.
NOTE: The low-battery icon will not appear when the batteries are depleted if the thermostat is connected to 24 VAC.
IN CASE OF DIFFICULTY
Screen is blank.
• Check circuit breaker and reset if necessary.
• Ensure the heating/cooling system is powered up.
• Ensure the furnace door is properly closed.
• Ensure two fresh AAA alkaline batteries are correctly installed.
Temperature settings cannot be changed.
• The System switch is off.
• You are setting the temperature outside its allowable range:
• Heat: 40 °F to 90 °F (4.5 °C to 32 °C).
• Cool: 50 °F to 99 °F (10 °C to 37 °C).
Cool On or Heat On is flashing.
• The compressor protection delay is underway. Wait for the delay to end
(maximum of 5 minutes).
HI appears on the screen. • The ambient (measured) temperature is above 122 °F (50 °C).
LO appears on the screen. • The ambient (measured) temperature is below 32 °F (0 °C).
E1 appears on the screen. • The temperature sensor circuit is opened. Replace the thermostat.
E2 appears on the screen. • The temperature sensor circuit is shorted. Replace the thermostat.
CUSTOMER ASSISTANCE
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