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Troubleshooting tips.
Problem
No display
System fan does not
come on properly
All thermostat buttons
are inoperative
Thermostat turns on and
off too frequently
Program schedule activates Check time (AM/PM) set on
at the wrong time
Thermostat does not
follow program
"PROG" flashes
(in Hold mode)
Fan runs continuously
Room temperature is
not correct
Compressor doesn't run
or turn off immediately
when changing function
or setting
Fan doesn't run or turn off
immediately when changing fan may have a 3 minute minimum
function or setting
"LO bat" displays on screen
Display reads "12:00 PM"
Problem not listed above
20
Solution
Check for 24 VAC at thermostat; display
is blank when 24 VAC is not present.
Verify that wiring is correct.
Verify that 24 VAC is present; unit
locks out when 24 VAC is not present.
Adjust temperature differential (see
Setting a New Temperature Differential).
thermostat (see Programming).
Verify that it is in Program mode; PROG
displays solid; check time (AM/PM);
check if in Hold mode (PROG flashing).
Press Hold button to remove from
Hold mode.
Check Fan Auto/On switch. If set to
ON position, fan will run continuously.
Verify that wall hole is plugged
with putty or insulation.
There is a 3 minute time delay and a
3 minute minimum run time for the
compressor when it turns on/off.
This is normal. On some models, the
run time/off time delay.
Replace batteries with 2 fresh "AA"
alkaline batteries.
Set clock/time.
Press the Reset button once. Reset
button function: time, day and mode
changed to last saved settings (saved
after power loss or when exiting
program setup; configuration and
program settings are unchanged).
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