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Troubleshooting Guide
IF… THEN…
Display will not come on. ■ Set the system switch to OFF; remove batteries and
insert them backward for at least five seconds to reset
the thermostat; replace the batteries correctly. The
display should come on.
■ Make sure the batteries are fresh and installed correctly.
Temperature display will not go ■ The temperature setting limit was reached. The
lower than 45
°F (7°C) or higher than setting range is 45°F to 88°F (7°C to 31°C).
88
°F (31°C) during programming.
Temperature change occurs at the ■ Verify the program times for the period. Be sure that
wrong times. 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 the switch on the thermostat is set to HEAT.
■ Check the system fuse or circuit breaker and replace or
reset, if necessary.