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Troubleshooting Guide
IF...
Display will not come on.
Temperature display will not go lower
than 45° F [7° C] or higher than 88° F
[31° C] during programming.
THEN
...
■ Set the system switch to OFF. Remove batteries.
Insert backward for at least five seconds to reset
thermostat. Replace batteries correctly. Display should
come on.
■ Make sure batteries are fresh and installed correctly.
■ Gently clean battery contacts using a soft pencil
eraser. Do not use anything abrasive on clips.
■ You have reached the temperature setting limit.
■ The setting range is 45° F to 88°F [7° C to 31 °C].
Temperature change occurs at the
wrong times.
Heating will not come on.
Check the program times for the period in
question. Be sure that AM and PM indications
are correct. Make sure the current day and time are
correct. Reprogram if necessary.
Check that switch on thermostat is set to HEAT.
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Heating will not come on
(continued).
Cooling will not come on.
■ Check the system fuse or circuit breaker and replace
or reset if necessary.
■ Check for correct wiring and good connections.
■ Jumper wires R and W. If heat does not come on,
contact your heating dealer.
■ If display is blank or says MbAt Lo,M install fresh
batteries.
■ If temperature setting is higher than current tempera¬
ture, and SYSTEM ON indicator is lit, contact
Honeywell Customer Assistance at 1-800-468-1502.
■ Check that switch on thermostat is set to COOL.
■ Check the system fuse or circuit breaker and replace
or reset if necessary.
■ Check for correct wiring and good connections.
■
Jumper wires Rc and
Y.
If cooling does not come on,
contact your cooling dealer.
■ If display is blank or says "bAt Lo," install fresh
batteries.
■ The thermostat has a built-in time delay on cooling.
Allow five to ten minutes after changing the setting
before the air conditioner starts.
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