User's Manual

PROBLEM SOLUTION
Thermostat is set on AUTO mode,
but the thermostat does not seem
to automatically change-over from
HEAT to COOL or vice-versa.
While adjusting the program
temperature or program times
in the HEAT mode, you notice the
changes affect the settings in
the COOL mode; and/or
vice-versa
Cannot change the thermostat
scale from °C to °F or vice-versa.
The thermostat has a built-in safeguard time delay of 30 minutes to prevent undesirable change-over
sequences from HEAT to COOL or COOL to HEAT. For example, if the thermostat was just running the
cooling system, it will take at least 30 minutes before it changes to heating. You may override this
manually by pressing MODE to change the operation to HEAT or COOL only.
The heating and cooling program times are linked, so same program start times (chosen for either
heating or cooling) will automatically be applied to the other.
When you set the HEAT and COOL program temperatures fairly close to one another, the thermostat
automatically restricts the two temperature settings from getting within 3°C (6°F) of one another.
The COOL temperature setting will always be at least 3°C (6°F) higher than the HEAT temperature
setting. For example, if the initial COOL program temperature was set at 24°C (75°F) and you decide
to adjust the HEAT program temperature to 24°C (75°F), the thermostat will automatically push the
COOL program temperature up to 27°C (81°F) to prevent overlapping.
Selecting the temperature scales is a one-time start-up process. After the first battery installation, you
must HARD reset the thermostat and choose the desired display in °C or °F. Otherwise, you CANNOT
change the temperature scale (°C or °F) later on unless you perform another HARD reset which will
clear all the programs and thermostat settings.
To perform a HARD reset and select °C or °F, first press and hold the HOLD, while at the same
time press and release the RESET button on the back of the thermostat. The LCD screen will blank
out momentarily. To select °F, select see the “optional settings” section.
43
The thermostat is not receiving a
signal from the remote transmitter.
Re-do the “Lean Procedure” to ensure an RF signal is being transmitted from the remote sensor to
the thermostat. (See “Remote transmitter” section)
The clock symbol is flashing
This indicates that the 3V (CR2025) lithium battery is low. This will not affect the normal operation
of the thermostat, but it should be replaced to ensure memory backup is maintained. Replace the
lithium battery with a screwdriver. (See diagrams for the location of the lithium battery)