15
TROUBLESHOOTING TIPS
Problem
Solution
No Display
Check for 24 VAC; display is blank
when 24 VAC is not present
System fan does not
come on properly
Verify that wiring is correct.
All thermostat
buttons are
inoperative
Verify that 24 VAC is present; unit
will not operate when 24 VAC is not
present.
Thermostat turns
on and off too
frequently
Adjust temperature differential
(see Configuration Mode - Setting
Temperature Differential, Stage 1,
Stage 2, and Stage 3 section).
Fan runs
continuously
Check fan selection. If set to ON, fan
will run.
Room temperature
is not correct
Verify that wall hole is plugged
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 or turn off
immediately when
changing function
or setting
There is a 3 minute time delay and
a 3 minute minimum run time for the
compressor when it turns on/off.
Fan doesn’t run or
turn off immediately
when changing
function or setting
This is normal. On some models, the
fan may have a minimum run time/off
time delay.
Problem not listed
above
Press the
Reset
button once to reset
the thermostat microprocessor.
