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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
20
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