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Troubleshooting Guide
I
F… THEN…
Display will not come on. ■ Set the system switch to OFF; remove batteries; insert
backwards for at least 5 seconds to reset thermostat;
replace batteries correctly. Display should come on.
■ Make sure batteries are fresh and installed correctly.
Temperature display will not go
lower than 7
° C [45° F] or higher than ■ You have reached the temperature setting limit.
31
° C [88° F] during programming. The setting range is 7° C to 31°C [45° F to 88°F].
Temperature change occurs at the ■ Check the program times for the period in
wrong times. question. Be sure that AM and PM indications
are correct. Make sure the current day and time are
correct. Reprogram if necessary.
Heating will not come on. ■ Check that switch on thermostat is set to HEAT.
■ Check the system fuse or circuit breaker and replace or
reset if necessary.
■ If display is blank or says "bAt Lo," install fresh
batteries.
■ If temperature setting is higher than current tempera-
ture, and SYSTEM ON indicator is lit, contact Honey-
well Customer Assistance at 1-800-468-1502.
Cooling will not come on. ■ Check that switch on thermostat is set to COOL.
■ Check the system fuse or circuit breaker and replace or
reset if necessary.
■ If display is blank or says "bAt Lo," install fresh
batteries.
■ The thermostat has a built-in time delay on cooling.
Allow 5 to 10 minutes after changing the setting before
the air conditioner starts.
■ If temperature setting is lower than current tempera-
ture, and SYSTEM ON indicator is lit, move system
switch from COOL to OFF for 10 minutes. After 10
minutes, return switch to COOL position. If air
