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IMPORTANT SAFETY INFORMATION
WARNING:
■ Always turn off power at the main power source by unscrewing fuse or switching circuit breaker to the off position
before installing, removing, or cleaning this thermostat.
■ Read all of the information in this manual before programming this thermostat.
■ This is a 24V AC low-voltage thermostat. Do not install on voltages higher than 30V AC.
■ If you experience a loss of power this thermostat will indicate “-AC” in the time field of the LCD display. This
means that your system’s 24V AC circuit is not receiving power or is not functioning correctly. The back-up
batteries provided in this thermostat will maintain the programming during the loss of power, however, the
thermostat requires 24V AC power and a functioning system for proper control.
■ All wiring must conform to local and national building and electrical codes and ordinances.
■ Do not short (jumper) across terminals on the gas valve or at the system control to test installation. This will
damage the thermostat and void the warranty.
■ This thermostat is equipped with automatic compressor protection to prevent potential damage due to short
cycling or extended power outages. The short cycle protection provides a 5-minute delay between heating or
cooling cycles to prevent the compressor from being damaged.
■ Do not switch system to cool if the temperature is below 50°F (10°C). This can damage the cooling system and may
cause personal injury.
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Symptom Remedy
Thermostat does not follow program. Check AM/PM indicators at time of day and programmed time changes.
(See “PROGRAMMING.”)
Thermostat may be OFF. Select HEAT or COOL mode by pressing SYSTEM
button.
Program may not have been done in HEAT or COOL modes.
(See "PROGRAMMING".)
Both HEAT and COOL programs utilize the same setpoint time and
programmable fan settings. Only setpoint temperatures can be different.
(See "PROGRAMMING".)
Check compatibility guide and system specifications.
Thermostat in MANUAL mode. (See “OPERATION.”)
Thermostat may not have been programmed in HEAT or COOL position.
Verify program. (See “PROGRAMMING – To Review or Change Program.”)
System runs too long. Temperature differential may be set too high. Decrease temperature
differential to lower setting, see "PROGRAMMING".