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SAFETY FEATURES
AC Power Monitor
■ This thermostat operates on 24V AC, which is provided by your system’s transformer. If
the system loses electricity, then the 24V AC power is lost also.
■ The 2 AAA batteries provide backup operation of the clock, as well as all programs
and settings.
■ If the AC power is lost, then the LCD display will alternate “No AC Pwr” with the day.
■ Without AC power, the following functions are disabled:
- The system is turned off.
- The Backlight function is disabled.
- The remote sensor temperature readings are not available.
No AC Pwr
PM
System Fan
Te mp
3
Low Batt
PM
System Fan
Te mp
3
Low Battery Warning
Your thermostat has a low battery warning system. When the
batteries are detected to be weak, the low battery warning is
indicated by “Low Batt” alternating on the LCD display with
the day. You then need to replace the batteries with 2 new
AAA alkaline batteries. You
have 30 seconds to change
the batteries before the set-
tings are lost.
41653_model43558.pmd
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Error Mode
Error
If the thermostat is unable to control your system due to an
unexpected problem, the thermostat will enter Error Mode. In
this condition, the thermostat flashes “Error” and a code num-
ber on the LCD display, and shuts off your system.
To correct this problem, replace the batteries with 2 new
AAA alkaline batteries, even if you have recently replaced
them. Next, use a paper clip to press the RESET button next
to the keypad. You will
need to reprogram your
thermostat and confirm
normal operation.
If Error Mode returns, please
call Climate Technology Tech-
nical support at 800-676-7861 for further information.