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Troubleshooting Guide
IF… THEN…
Display will not come on. Check that the green light emitting diode (LED)
located to the left of the LCD is lit, indicating the
thermostat is powered properly.
Temperature display will not go lower You have reached the temperature setting limit.
than 45°F (7°C) or higher than 88°F The setting range is 45°F to 88°F (7°C to 31°C).
(31
°C) during programming.
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 the green LED is lit.
Check that the switch on the thermostat is set to
HEAT.
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