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Troubleshooting tips.
No display Check for 24 VAC; display is blank
when 24 VAC is not present.
System fan does not Verify that wiring is correct.
come on properly
All thermostat buttons Verify that 24 VAC is present; unit
are inoperative will not operate when 24 VAC is not
present
Thermostat turns on and Adjust temperature differential
off too frequently (see Configuration Mode - Setting
Temperature Differential, Stage 1 and
Stage 2 sections).
Fan runs continuously Check Fan Auto/On switch. If set to
ON position, fan will run continuously.
Room temperature is Verify that wall hole is plugged
not correct with putty or insulation to prevent
airflow from the wall cavity.
Adjust Temperature Offset (see
Configuration Mode - Room
temperature offset section).
Compressor doesn’t run There is a 3 minute time delay and
or turn off immediately a 3 minute minimum run time for
when changing function the compressor when it turns on/off.
or setting
Fan doesn’t run or turn off This is normal. On some models, the
immediately when changing fan may have a minimum run time/
function or setting off time delay.
Problem not listed above Press the Reset button once to reset
the thermostat and restore all factory
settings.
Problem Solution
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