Troubleshooting tips.
No display
Check for 24 VAC at thermostat and
batteries; display is blank when 24 VAC
is not present and batteries are bad.
System fan does not
Verify that wiring is correct.
come on properly
All thermostat buttons
Verify that 24 VAC is present; unit will not
are inoperative
operate when 24 VAC is not present.
Thermostat turns on and
Adjust temperature differential (see
off too frequently
Configuration Mode - Setting
Temperature Differential, Stage 1
and
Stage 2
sections).
Program schedule activates
Check time (AM/PM) set on
at the wrong time
thermostat
(see
Programming
).
Thermostat does not
Verify that it is in
Program
mode;
PROG
follow program
displays solid; check time (AM/PM);
check if in
Hold
mode (
PROG
flashing).
“PROG” flashes
Press
Hold
button to remove from
(in Hold mode)
Hold
mode.
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 with
not correct
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 a
or turn off immediately
3 minute minimum run time for the
when changing function
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.
“ ” displays on screen
Replace batteries with 2 fresh “AAA”
alkaline
batteries.
Problem Solution
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